# Dynamic Pricing under Cost Reduction in the Presence of Myopic and Strategic Consumers

Authors: Guangning Liu; Zhenzhong Guan; Hua Wang
Journal: Discrete Dynamics in Nature and Society
 (2019)

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## Abstract

After release, a product usually suffers cost reductions during its whole lifespan. Compared to the myopic, strategic consumers may have stronger incentive to delay the purchase once they perceive that a significant cost reduction will result in a markdown. The strategic (compared to the myopic) properties influence the seller both quantitatively in terms of proportion of strategic consumers and qualitatively in terms of customer patience. To forecast the reaction of the whole market under cost reduction, it is necessary to acquire the strategic properties. In this paper, we study the impacts of proportion of strategic consumers, customer patience, and cost reduction on dynamic pricing strategy when cost reduction comes from technology advancement. The seller makes pricing strategies when facing unknown future cost, and the buyer makes purchase decisions when facing unknown future price. Our study shows that generally both higher strategic consumer proportion and customer patience contribute to a delay in sales. Further, profit diversion happens under great combination of strategic properties. In addition, with the increase of customer patience, not only strategic but also myopic consumers will buy less. Finally, the strategic properties moderate the pricing strategy in latter stage when there is a cost reduction. This indicates a threshold as combination of strategic properties, upon which seller tends to offer a smaller markdown to discourage strategic waiting, and under which seller tends to offer a greater markdown to divert strategic consumers to the latter period.


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## Body

## 1. Introduction

Have you bought the recently released Huawei Mate 20 Pro? The new generation of Huawei’s flagship, Huawei Mate Series, had been unveiled on October 16, 2018, in London as it is reported by Joseph [1]. Also after this release, there exists a sharp price drop of 25% on the elder generation Mate 10. On the one hand, it may be a common measure to stimulate demand under the release of a new generation. On the other hand, the price drop may be out of cost reduction, which is on the basis of technology advances during the whole life circle of the product. And this kind of effort of Huawei on technology advancement had also been reported on Reuters by Eric [2]. Anyway, the sharp price drop always attracts the customers who are waiting for it.There commonly exist two types of consumers in the market, according to Levin [3]. One is the myopic consumer who makes a purchase decision as long as the price tag is lower than his valuation for the product despite the potential markdown on price in the future. This supposition contributes to tractable models and significantly handy analysis and leads to transparent properties for dynamic pricing strategies. The other type is strategic consumer, like the one waiting for the price cut of elder Huawei Mate 10. That is, strategic consumers not only decide whether to buy depending on the present valuation and price, but also time their purchase strategically to maximize their consumer surplus. In fact, the market is usually the mixture of these two kinds of people. This compels researchers to take proportion of strategic consumers (the ratio of strategic consumers to the whole market) into consideration, like Li [4]. Further, delaying purchase in anticipation of price reductions also has a bad influence as it sacrifices present usage and current value. This forces scholars to include the discount factor into the trade-off between purchase stages, which habitually appeared as customer patience in [5] by Shum.Huawei may hope a sale boom of the new smart phone and they decide to turn down the price of Mate 10 to give road of it. However, cost reduction, arising from technology advances, also plays an important role in price cut. President of HUAWEI Business Group, Yan, stated that Huawei has invested more than 400 billion Yuan on R&D in the last ten years as reported by Zhang [6]. This type of cost reduction, which we call technology advancement effect, is independent of previous production quantity, compared to production learning effect. The technology advancement effect is usually pretended as an exogenous variable, and on the contrary, the production learning effect is always treated as the endogenous one. Production learning comes from learning by doing according to Shum [5], and this kind of cost reduction increases with the first-period production quantity. Furthermore, it is vital for worker training by which the production process is easier to control and production technics is easier to master. Additionally, it is necessary to emphasize that, under the case of production learning, the production quantity is usually not transformed into inventory.In this paper, we both study the firm’s pricing strategies and consumers purchase decisions under dynamic pricing. This pricing strategy gives a high degree of flexibility which distinguishes it from the price commitment and price matching. Further, the dynamic pricing strategy also comes as the most common strategy in practice. From the demand side, we consider a mixture market of both strategic and myopic customers, and there exist product availability and purchasing opportunities in both periods. Also from the supply side, the seller as the monopoly controls the pricing power, and out of dynamic pricing case he also has the absolute freedom of two-period pricing without any extra cost and constraints.We also consider the incentives by cost reduction. For buyers, especially the strategic ones, cost reduction may give rise to the motivation of waiting, because they expected a higher price cut in the latter period. And for the seller, cost reduction may also contribute to the delay of sales, because there exists a higher profit margin in the latter period.In particular, we analyze the impact of strategic properties and cost reduction. We study the strategic properties from two dimensions: proportion of strategic consumers and customers patience. These properties indicate the influences on the seller both quantitatively in terms of proportion of strategic consumers and qualitatively in terms of customer patience. As for the cost reduction which is mainly from the technology advancement, we analyze the influence of cost reduction separately and study strategic properties and cost reduction effect mutually to see if there exists some mediating or moderating effect. Apart from that, we study the robustness of optimal pricing strategies, sales, and expected profit.Our analysis leads to several interesting insights. First, we have investigated the impact of strategic properties on pricing, sales and expected profit. From the demand side, a high proportion of strategic consumers contributes to the delay of purchase, which is manifested as the demand decrease in the first period and increase in the second period. Further, from the supply side, when observing this delay, the seller tends to adjust pricing strategy to remedy this trend. As a result, the profit decreases. These serial reactions also happen on the customer patience. However, when these come to the customer patience, some counterintuitive results come into being. According to our analysis, the strengthening customer patience which as a property belonging to strategic consumers can also lead to the decrease in myopic demand.Apart from that, when facing great enough proportion of strategic consumers (or customer patience), there exists a profit diversion, which means the main profit sources from the latter period. And when profit diversion happens, the seller has to pay more attention to the second stage, and out of the flexibility of dynamic pricing, the seller may be more lucrative than in other pricing strategies, like price commitment and price matching.In addition, a significant cost reduction induces more strategic waiting, which is consistent with our common sense. Further, the technology advancement may always increase the expected profit, when we have not taken into consideration the expense of R&D. (The simplified analysis including the TA expenses has also been conducted in AppendixB. This analysis also indicates a proper TA is reasonable.)Besides, contrary to conventional wisdom, an intensified cost reduction does not always depress the second-period price. Rather, there exists a threshold under cost reduction. Seller tends to offer a smaller markdown in case of the combination of strategic properties upon it and a greater one otherwise.This paper is organized as follows. Section2 reviews the former literature. Section 3 introduces our model. Section 4 analyzes the equilibrium under the impact of strategic properties and cost reduction. Section 5 provides conclusion remarks.


## 2. Literature Review

Our paper relates to several bodies of research: the literature on dynamic pricing, strategic properties, and the literature on cost reduction.There exists a notable success on dynamic pricing and revenue management. Starting from Gallego and van Ryzin [7], more studies pay attention to stochastic models with a Poisson arrival of myopic consumers. On the contrary, researchers try to take strategic consumers into consideration, which makes monopolistic pricing model more complicated. Thus, a deterministic model is often derived, like the one in the research of Besanko and Winston [8]. This model depicts a dynamic programming procedure to compute the dynamic pricing strategy including rational behavior. Su [9] investigates intertemporal pricing strategy within a market containing both strategic and myopic consumers and by high-valuation and low-valuation segments. Customers in this study arrive continually among the duration of the selling period. This article concludes when the seller should use markdown. Xiong [10] designs a dynamic programming model within a continuous-time Markov decision process to study a remanufacturing problem in the presence of random price-dependent returns and random demand. In the following studies of dynamic pricing strategy when facing forward-looking consumers, Aviv and Pazgal [11] study the optimal dynamic pricing strategies of fashion-like seasonal products and make a comparison between strategic and myopic consumers. Liu and van Ryzin [12] figure out that the strategic capacity rationing induces early purchases under dynamic pricing strategies. Furthermore, the studies start to include products quality in dynamic pricing questions. Li [13] builds a two-stage dynamic pricing model to investigate the online video service and it shows that pricing strategy is affected by videos available time and borrower’s emotional factor. Furthermore, the recent development in applied mathematics, for example, Pandey [14] and Navarro [15], also stimulates the further studies in dynamic pricing.In addition to the studies on dynamic pricing strategies when facing strategic consumers like Levin [3], price commitment is also a common pricing strategy in revenue management. Su and Zhang [16] indicate that promising can improve expected profit which includes not only quantity commitment but also pricing commitment. This commitment induces consumers to make the purchase decision earlier at a relatively high price maintaining the exclusivity of the product. This commitment solves the challenge from strategic consumers to contract which usually exists in newsvendor problem. As we all know, it is essential for a supply chain to build contractual relationship between retailers and suppliers, which can eliminate double marginalization by cooperating firm’s goals. Cachon [17] gives detailed analysis on supply chain coordinating, in particular by contracts. But troublesome happens when facing the strategic consumers, because “the centralized optimal solution benchmark may not be appropriate anymore” in Su’s [9] explanation.Compared with the two strategies above, price matching becomes more cordial to consumers when seller guarantees to reimburse the price difference to a consumer who buys a product before the seller marks it down. This posterior price matching policy is associated with strategic consumers by Lai [18]. Under his study, PM policy weakens strategic consumers’ waiting incentive and thus helps the seller to raise price in regular selling season. However, the research on PM policies has been mainly conducted in economics and marketing, which aims to advance in competition. The literature was initiated by Salop [19], Holt and Scheffman [20], and Png and Hirshleifer [21]. They describe the function of PM policy on competition. Further, the recent study on PM policy can also be seen in Chen [22] and Kukar [23].The additional studies of strategic consumers to dynamic pricing begin from the study of Besanko and Winston [8], which was addressed before. There must be some properties that distinguish them from myopic ones. Myopic consumers only have one decision: whether to purchase. However, the strategic consumers have the additional one: when to purchase. This distinction appears in [24] by Prasad. Apparently, the strategic consumers are born to have the additional choice. However, the strategic waiting still has expenses. The strategic consumers entering the market make the decision either to purchase under current price, to leave the system, or to wait for a more attractive price. Further, if they choose to wait, customers incur waiting cost in [9] by Su. This waiting cost is usually depicted as customer patience. On the other hand, mixed market with both strategic and myopic customers is common in former studies. This induces the consideration of consumer constituent. Kremer [25] proposes a theory and conducts an experiment under dynamic pricing in the presence of both strategic and myopic consumers. The proportion of strategic consumers moderates the optimal pricing strategy, and similar results were found in the survey in air-travel industry by Li et al. [4]. Besides, Shen and Su [26] introduce modeling in revenue management and auctions with consideration of consumer behavior. Also, more and more researchers in revenue management, especially dynamic pricing, bring strategic properties into their papers, like Levin [3].Cost reduction also plays an important role in our paper. According to the description by Shum et al. [5], cost reduction has mainly two dimensions: technology advancement and production learning. For technology advancement, there is no relationship with the first-period production quantity under the case of dynamic pricing, whereas for the production learning effect there is. Further, the former papers mostly concentrate on the production learning effect. The production learning effect first appears in a paper by Arrow [27]. Empirical studies mainly pay attention to measure how significant the production learning effect is, for example, Rosen [28] and Pruett [29]. On the analytical side, researchers also perform a lot of models to depict the influence of production learning effect, such as Jin [30] and Terwiesch [31]. Different from production learning effect, technology advancement usually happens without relation to production quantity. There are less papers on technology advances in production, but more on competition, like the one by Erat [32].In this paper, we investigate the cost reduction impact on the market containing both myopic and strategic consumers under dynamic pricing. First, different from most former studies in dynamic pricing area, we take both strategic and myopic consumers into consideration, which fits more conventional wisdom. Further, we derive a model picturing the strategic consumers from two dimensions, proportion of strategic consumers and customer patience, and also analyze the joint influence of them. In addition, apart from the strategic influence on sellers, we also perform the strategic influence on nonstrategic (myopic) consumers. And the additional consideration of cost reduction to dynamic pricing is not included in most former researches. This cost reduction arising from technology advances also plays a very important role in decisions of both supply and demand sides.


## 3. Model Description

This paper considers a monopolistic firm who sells product to a market with a mass of infinitesimal consumers over two periods. Without loss of generality, we assume that the market size is determined and normalized to 1. We assume that valuation of customersv is distributed uniformly on the interval [0,1]. And each consumer can buy no more than one unit of product.We consider our problem when facing both myopic and strategic consumers, and we assume the proportion of strategic consumers asθ∈[0,1] and then the proportion of myopic as 1-θ. Each customer takes the purchase decision and the firm decides the two-stage prices, denoted by pi,i=1,2. While myopic consumers simply decide whether or not to buy, consumers behaving strategically will also take into account when to buy, similar to the description by Shum et al. [5]. We also assume that strategic customers discount future utility by a factor δ∈(0,1); that is, when a customer has valuation v, the utility for him to wait until the latter period is δ(v-p2). This factor is also used by Aviv and Pazgal [11] and Besanko and Winston [8].The selling season can be divided into two periods and the firm chooses dynamic pricing strategy to implement. With dynamic pricing, the prices are declared at the beginning of each period, in order to maximize the firm’s profit to go, which is from Aflaki [33]. With generality, the firm is risk neutral and makes pricing decisions to maximize its total profit. In addition, we assume that the production cost is fixed at c∈(0,1) in the former period; however, the cost will be depreciated in second period. In particular, the cost reduction is mainly from technology advancement. As a result, the actual cost in the beginning of the latter stage will be at c-α, where we use α∈(0,1) to represent the TA (technology advancement) effect, the same as the assumption by Shum et al. [5].This paper takes into consideration both myopic and strategic consumers, which can also be seen in former papers, like those by Su [9] and Cachon and Swinney [34]. However, there are also some studies only concentrating on strategic consumers, like those by Liu and Van Ryzin [12] and Shum [5]. Among pricing strategies, dynamic pricing is the most flexible one. It provides the flexibility to determine later price without any commitment to consumers. Prior researches include those by Shum [5] and Kremer [25].Under dynamic pricing strategy, we solve this problem backward by first analyzing the optimal price in the second period. A myopic consumer makes purchase decision on whether the posted price is below his valuation in each period.Lemma 1.
Aware of early pricep1, strategic consumers expect the price p2(p1) in the second season. There exists a v-=min⁡⁡{1,(p1-δp2p1)/(1-δ)} such that strategic consumers with v<v- will wait until the second period and strategic consumers with v>v- will make purchase decision in the first period.The proofs of all lemmas appear in AppendixA. Note that whenever v-=1, no strategic consumers are buying in the early season. According to Lemma 1, a strategic consumer will buy a product in the early period if his immediate consumer surplus v-p1 exceeds the discounted expected surplus δ(v-p2) in later period; and he will make purchase decision in second stage otherwise.We use Table1 and Figure 1 to conclude the demand (sales) for each consumer segment by season. Suppose strategic consumers with valuation higher than v- are going to purchase in the first stage; we can get the critical condition of strategic consumer’s valuation,(1)v--p1=δv--p2.Also the demand of first period is Q1=1-1-θp1-θv-, and the demand of second period is Q2=1-θp1+θv--p2. The firm’s expected profit in the second period is (2)π2=θv--p2+1-θp1-p2p2-c2.We take the second derivative of second-period profit π2′′(p2)<0, which means that π2 is concave in p2, so the first-order condition gives rise to the optimal strategy,(3)p2∗v-=121-θp1+θv-+c2.From above, we can get the critical strategic consumers’ valuation between two purchasing periods (4)v-=min⁡1,2-δ1-θp1-δc221-δ+δθ.Denote vE=(2-δ1-θp1-δc2)/(21-δ+δθ). Through the analysis above, we know the firm’s total expected profit in case of both myopic and strategic consumers during two operational phases(5)π∗=p1-cQ1m+Q1s+p2-c2Q2m+Q2s,ifvE<1;p1-cQ1m+p2-c2Q2m+θ1-p2,ifvE≥1.We denote the optimal profit as π2s when vE<1, and as π1s when vE≥1.Table 1
Demand (sales) to each consumer segment by period.
First period Second period Myopic demand Q 1 m = ( 1 - θ ) ( 1 - p 1 ) Q 2 m = ( 1 - θ ) ( p 1 - p 2 ) Strategic demand Q 1 s = θ ( 1 - v - ) Q 2 s = θ ( v - - p 2 ) Total demand Q 1 = 1 - 1 - θ p 1 - θ v - Q 2 = 1 - θ p 1 + θ v - - p 2Figure 1
Customer segmentation between strategic and myopic customers.When there is cost reduction in the beginning of second period, the cost in the second period isc-α, and we have to consider the consumer purchase strategy, firm’s optimal pricing, and profit. Further, we will give more details on the impact of the cost reduction due to technology advances in next section.


## 4. Equilibrium under Dynamic Pricing

In this section, we study the firm’s pricing strategy and profit and characterize the impact of several important parameters. Also, we show the difference between the basic case and the one under cost reduction, which results from technology advancement.On the one hand, both strategic and myopic consumers would conduct their purchase decision in both periods, whenv-<1. Under dynamic pricing, which is prevailing both in research and practice, the firm’s total expected profit should be solved backward by first analyzing the optimal price in the second period,(6)p2∗v-=121-θp1+θv-+c-α,where v-=(2-δ1-θp1-δ(c-α))/(21-δ+δθ), in this cost reduction situation, and the firm’s total profit.(7)π2sp1=c-p1δθα-c+2p1-1-2δp1+2δ+2p1-2θδ-2δ+2+θδ-δ+12α-c+p12θδ-2δ+22,s.t.2-δ1-θp1-δc-α21-δ+δθ<1The condition above equals vE<1, which guarantees that the strategic consumer’s purchase happens in both periods. That is to say, when the critical valuation is greater than 1, the strategic consumers will only purchase in the second period.The second derivative of the two-period profitπ2s′′p1<0, which means that π2s is concave in p1. By using the first-order condition, we can get first-period optimal price p1∗. After that, we can also form the second-period optimal price p2∗.Proposition 2.
Optimal pricing and expected profit for the seller under different critical valuations:
(  1  ) When vE≥1, the optimal pricing for the seller is p1,1s∗,p2,1s∗={(c+θ+α+2)/(θ+3),(2c+1+θ1-α)/(θ+3)}, and the seller’s expected maximum profit can be formed as π1s∗=(α2+1-c2+1+θ1-c)/(θ+3).
(2) WhenvE<1, the optimal pricing for the seller is p1,2s∗,p2,2s∗=(N1α+N2c+N3)/2δθ-δ+1δθ-3δ+3,(N4α+N5c+θδ-2δ+2)/2θδ-3δ+3, and the seller’s expected maximum profit can be formed as π2s∗=(c2δθ-2δ+22+c(2δ2θ2+δ+2M1)+(α2M2+α+1M3-δ2θ2)))/4δθ-3δ+3δθ-δ+1, where N1=δ2θ2-2δ2θ+2δ2+2δθ-4δ+2, N2=δ2θ2-4δ2θ+2δ2+4δθ-4δ+2, and N3=δ2θ2-4δ2θ+4δ2+4δθ-8δ+4; N4=θδ+2δ-2, N5=θδ-4δ+4; M1=-2δ2θ2+4δ2θ-4δθ-4δ2+8δ-4, M2=5δ2θ2-8δ2θ+4δ2+8δθ-8δ+4, and M3=2δ2θ2-4δ2θ+4δ2+4θδ-8δ+4. (Note that vE=(2-δ1-θp1-δc2)/(21-δ+δθ), and all surrogate parameters above mainly consist of strategic consumers proportion θ and the consumer patience δ.)On the one hand, the strategic consumers may not purchase in the first period when the critical valuationvE≥1. The expected profit is π1s=p1-cQ1m+p2-c2Q2m+θ(1-p2). We conduct the second derivative of profit π1s′′(p1)<0 and π1s′′(p2)<0, which implicate that π1s is concave in both p1 and p2. By using the first-order condition, we get two-period optimal price p1∗ and p2∗.On the other hand, when facing the strategic demand only in the second period, we can just treat this single-period demand as myopic. In other words, there exists no strategic waiting in single period, and this can also be reflected in our result of expected profit where there is no parameter of consumer patience.This phenomenon makes the decision process easier, and seller can make a more identical strategy. However, we should also be aware of the common ground with the previous situation. That is, there still exists myopic demand in the first period in this paper, which means the company should adopt two-period pricing policy to maximize the total profit. Next, we will further discuss our findings on the critical condition of whether strategic consumers purchase in both periods.Note that we factor the condition ofvE and find that strategic consumers will buy in both periods if α/(1-c)<(δ2θ2+δ2θ-2δ2+2δθ+2)/(δ2θ2-5δ2θ+4δ2+4δθ-6δ+2), and only in the second period otherwise.From this condition, we can see that the left side is obviously increasing in bothα, the technology advancement effect, and c, the variable cost before technology advances. This indicates that greater technology advancement and higher variable cost will delay the purchase of strategic consumers. Due to TA effect, strategic consumers would like to wait and expect a markdown in the second period and then make their tradeoffs. However, the higher variable cost may lead to the price of first stage going up, because of which less strategic consumers would buy the products in the former stage.On the other hand, the myopic demand has a close relationship with the two-period price and seems more steady. However, the TA effect and initial cost may have a mediation effect on myopic demand by pricing.Differentiated from the market only with strategic consumers, in our study, the seller still has two periods of decision. And the marginal profit within two periods differs. This implicates that there is still a necessity to combine pricing policies to maximize the total profit.


### 4.1. Impact of Cost Reduction

Now we turn to the influence of cost reduction under dynamic pricing strategy. Cost reduction may come from a reduction in the variable cost with technology improvement. This kind of cost reduction is independent of sales in the former period. In this section, we consider the impact of cost reduction on pricing policy and expected profit in Proposition3 and sales in Proposition 4.Proposition 3.
Impact of technology advancementα on firm’s pricing and expected profit:
(1) For the optimal price in the first stage,∂p1∗/∂α>0, while for the optimal price in the second period, ∂p2∗/∂α>0 when θ>2(1-δ)/δ, and ∂p2∗/∂α≤0 when θ≤2(1-δ)/δ.
(2) For the firm’s expected profit,∂π2s∗/∂α>0.When there exists cost reduction, the firm always has a strong incentive to stimulate the later demand because of the higher marginal profit in the second period when facing technology advancement. So it is easy to understand why sellers tend to increase the first-period price. However, this results in the second-period pricing strategy bias. In other words, the optimal price in the second period is conditionally increasing inα (or conditionally decreasing in α).We select different value ofδ and θ to derive the indifference curve of the condition which reverses the optimal pricing trend in the second period. When satisfying the condition θ<2(1-δ)/δ (or Area 1), seller should lower the price, and when θ>2(1-δ)/δ (or Area 2), seller should raise the price.When facing the cost reduction in the latter period, the firm normally increases the first-period price to make much demand shift from period 1 to period 2. Then the second-period market will reach a new equilibrium where demand becomes higher and price becomes lower compared with the former equilibrium. These ordinary changes can always be read in managerial economic books, such as Png [35]. Nevertheless, our finding seems to be counterintuitive. That is, raising second-period price is not always the optimal strategy in the reaction of the cost reduction. However, it depends. When the proportion of strategic consumers in the market is less than the criteria, θ<2(1-δ)/δ, the increase of cost reduction will push the seller to lower the price; when it is more than that, θ>2(1-δ)/δ, the increase of cost reduction will motivate the seller to raise the price. And this critical boundary has been illustrated in Figure 2. Or we can conclude it as increase of the second-period price depending on the constituent of consumers. Therefore, it is vital for the company to figure out the constituent before making the second-period pricing strategy.Figure 2
Second-period pricing strategy with condition under cost reduction. Note. Area 1,θ<2(1-δ)/δ; Area 2, θ>2(1-δ)/δ.Another observation is that no matter what the proportion of strategic consumers in the market is, the total profit is always ascendant with the rise of technology advancement. On the one hand, the increasing trend of profit is not surprising, because the technology advancement improves the marginal profit. On the other hand, it is a little out of common sense that the firm should implement the technology innovation as possible as it can. The reason is that we do not take the expense of technology advancement (used to be fixed cost) into consideration. If we add the fixed costfc to the profit condition, then the result would differ. When considering the fixed cost, the profit with the rise of technology innovation will be decreasing in the beginning and increasing in the end. This relationship between fixed cost and profit can also be read in [35] by Png. And we simply conduct several groups of numerical experiments to confirm this point of view.Proposition 4.
Impact of technology advancementα on demand (sales):
(1) For the demand in the former period,∂Q1/∂α<0, and for the demand in the latter stage, ∂Q2/∂α>0. And the total demand can be increasing or decreasing in α: ∂Q/∂α>0 when θ<2(1-δ)/δ, and ∂Q/∂α≤0 otherwise.
(2) The demand of both myopic and strategic consumers can be increasing or decreasing inα: ∂Qm/∂α>0 and ∂Qs/∂α>0 when θ<2(1-δ)/δ, or ∂Qm/∂α≤0 and ∂Qs/∂α≤0 otherwise.It is easy to understand the shifts where consumers tend to decrease the purchase in the first period and increase the purchase in the second period, because of the optimal pricing strategy, which has been the finding in Proposition4, in addition to the total demand bias under the different constituent of consumers (as shown in Figure 3), which is similar to the findings in Proposition 4. That is, when there is greater proportion of strategic consumers in the market, the total sales will decrease and increase otherwise. More consumers choose to wait. This is especially true when the technology advancement effect is significant. Thus, in this situation, a large demand will be transferred to next period. Then the pricing strategy in the second period matters; as a result, the total demand of product will increase in α when θ<2(1-δ)/δ and decrease otherwise.Figure 3
Moderation effect from combination ofθ and δ.If we divide the demand depending on different consumer segments, the other observation is that both myopic and strategic demand will increase inα when θ<2(1-δ)/δ and decrease otherwise. On the one hand, for myopic consumers, it is the decrease of the second-period price that contributes to the rise of total demand of myopic consumers when facing the lower proportion of strategic consumers (price shifts have been proved in Proposition 3). On the other hand, for strategic consumers, the demand will increase because of the lower price in second period without customer constituent change. In conclusion, customer constituent has a moderation impact on the relationship between technology advancement effect and both myopic and strategic demand. This meaningful finding reminds the company that the constituent analysis and patience investigation of consumers are necessary before operating a technology advancement task.


### 4.2. Impact of Strategic Consumer Proportion

After recognition of cost reduction impact, now we turn to the influence of strategic consumer proportion. This ratio, which reflects the constituent of consumers in targeted market, turns out to be very important for policy makers especially when facing forward-looking customers. The influence is directly exerted on pricing and sales policies and, as a result, on optimal profit. In this section, we provide some insights into optimal solutions when considering the impact of strategic consumer proportion. In particular, we first consider the impact on expected sales in Proposition5.Proposition 5.
Impact of the proportion of strategic consumersθ on demand (sales):
(1) The demand for the first stageQ1∗ is decreasing in θ, but the demand for the second stage Q2∗ is increasing in θ. Anyway, the total demand Q1∗+Q2∗ will be decreasing in θ.
(2) The difference between two-stage demandQ2∗-Q1∗>0 if and only if c<θ(2-δ)/(δθ+2-2δ), and ∂(Q2∗-Q1∗)/∂θ>0.
(3) If divided by consumer segmentation,∂Qm/∂θ<0 and ∂Qs/∂θ>0.Figure4 illustrates how proportion of strategic consumers influences the demand, when δ=0.7, c=0.5. Note that cost reduction from technology used to have a relatively low extent of impact on cost reduction, and we set α=0.01. From Figure 4(a), with increase in θ, the demand for the first period decreases, but the one for second period increases. We can also find that the total demand decreases, and the difference between two stages becomes larger.Figure 4
Impact of the proportion of strategic consumerθ on demand (sales).
(a)
By different purchasing stages (b)
By different customers segmentsFrom Figure4(b), with the increase in θ, the total demand of strategic customers increases and demand of myopic customers decreases. However, the total demand will increase.If we divide the total sales by different purchasing stages, it is better for the firm to sell less products in the first period and more in the second period, with increase of strategic consumers proportion. With significant technology advancement effect, consumers will have a strong incentive to wait. Also, the rise in the proportion of strategic consumers may lead to more consideration of the trade-off between two purchasing stages. The company should provide a significant cutoff on the first-period price to weaken the incentive, which may contribute a bigger profit loss than that when just letting them delay the purchase. In addition, the firm may prefer more customers to wait because the significant technology advancement effect raises up the profit margin of product in the latter period.The total demand decreases, which can be interpreted by the fact that the increase in the second-period demand cannot make up the fall in the first-period demand. This can be proved by the difference between two period salesQ2∗-Q1∗ decreasing in θ. When facing the cost reduction, more strategic consumers would delay their purchase as we discuss above and part of them will give up their purchase. The former choice will transfer the demand from first period to second; however the latter situation contributes to loss of customers. On the one hand, the strategic consumers whose valuation vs<v- (according to Lemma 1.) would have made purchase decision in the first period, but the message of cost reduction may mislead them, which induces more consumers to wait until the second period. On the other hand, the firm will increase the price in the second period to improve the profit. The strategic consumers lose the product availability and purchasing opportunities in the first period. In this situation, especially the strategic consumers will lose the freedom of when to buy and only have the choice of whether or not to buy. Besides raising up the second-period price, firm can decrease the first-period price to improve profit, which will be further discussed next.Additionally, if we divide the total sales depending on different consumer segments, the sales from myopic consumers will decline sharply and the sales from strategic consumers will rise. This is mainly because the proportion of strategic consumers increases. As a result, the firm should pay more attention to and make specific strategies targeting the strategic consumers.Similarly, we have also conducted the robustness analysis on the impact of the proportion of strategic consumersθ on firm’s pricing and expected profit:( 1 )   p 1 ∗ is decreasing in θ and p2∗ is increasing in θ. However, the reduction range p1∗-p2∗ decreases in θ.( 2 ) The expected profit for the first period is decreasing in θ, and the expected profit for the second period is increasing in θ. However, the total profit of company π2s∗ is decreasing in θ.As we have mentioned above, the increase in proportion of strategic consumers means more strategic consumers such that they will consider their surplus from purchasing the product and make a trade-off between two stages to maximize their surplus. This may worry the firm in that the sales in the first period where the marginal profit is relatively higher will drop, which motivates the firm to reduce the first-period price to retain more consumers making purchase decision in the former stage and weaken the trend of transferring demand to second period. On the contrary, the company may have motivation to attract strategic consumers to the second period. In the second period, the strategic consumers only have the purchase decision of whether to buy, and lose the freedom of timing their purchase stages. As a result, the firm may raise up the selling price to maximize their profit. What is more, the difference between the prices in two stages will decrease with the rise of strategic consumers. This is easy to explain because of the opposite shift directions of two-stage prices.Actually, we get the conclusion that the first-period price should descend with more strategic consumers in the market. It really concerns us that there is still some motivation behind raising the price in the former stage, that is, the influence of cost reduction. With massive selling quantity, each dollar of cost reduction would make the seller more rubricate. This may indicate that more demand, especially strategic demand, met in the second period benefits the seller where higher marginal profit happens with the significant technology advancement. This counterintuitive finding can also be read in the studies by Kremer [25] and Shum et al. [5].Furthermore, the expected profit will go up in the first period and go down in the second period. This keeps pace with the change of price which is lower in the beginning and higher in the end. In addition to the reason of price, we cannot ignore the shifts in sales. More strategic consumers choose to delay the purchase until the second period. These two reasons explain why the expected profit is up sooner but down later. Moreover, the total profit will decrease when facing more forward-looking consumers in the market. On the one hand, the total sales quantity decreases, which can be found in Proposition5(1). On the other hand, the firm should increase the first-period price and decrease the second-period price, which makes it hard for us to tell whether the average profit will decrease or not. However, the potential motivation we talked about above may help explain the decrease of the total profit.


### 4.3. Impact of Customer Patience

Customer patience, in a way, can be viewed as waiting cost, according to Su [9]. This usually measures the extent of willingness to wait, for strategic consumers. In addition to the quantitative effect of strategic consumer proportion, it is another dimension to study the characteristic of market. We provide insights into the optimal solution for operational policies makers particularly when facing heterogeneous strategic consumers. This part focuses on the surprising impact of customer patience, as a property belonging to strategic consumers, on myopic demand in Proposition 6. Moreover, we cast light on the relationship between strategic consumer proportion and customer patience in Proposition 7, especially when maximizing the expected profit. The numerical study also examines the robustness of both these parameters.Sharing the similarity with the robustness analysis of strategic consumers proportion, we also perform the analysis of customer patience. First, the analysis suggests the following:( 1 ) The demand for the first stage Q1∗ is decreasing in δ, but the demand for the second stage Q2∗ is increasing in δ. Anyway, the total demand Q1∗+Q2∗ will be decreasing in δ.( 2 ) The difference between two-stage demand Q2∗-Q1∗>0 if and only if c<θ(2-δ)/(δθ+2-2δ), and ∂(Q2∗-Q1∗)/∂δ>0.In addition, we conduct the analysis of customer patienceδ on firm’s pricing and expected profit:( 1 ) Let p1∗ and p2∗ be the equilibrium prices. Then p1∗ is decreasing in δ and p2∗ is increasing in δ. However, the reduction range p1∗-p2∗ decreases in δ.( 2 ) The expected profit for the first period is decreasing in δ, and the expected profit for the second period is increasing in δ. However, the total profit of company π2s∗ is decreasing in δ.These results share so much similarity with the analysis for strategic consumers proportion, and that can be explained by the negative effect of strategic properties. However, according to our analysis, there also exist some counterintuitive findings of customer patience, which is relatively different from strategic proportion. And these findings will be shown in Proposition6.Proposition 6.
With the increase of customer patienceδ, not only strategic but also myopic consumers will buy less (∂Qm/∂δ<0, ∂Qs/∂δ<0).We describe proportion of strategic consumers as parameterθ and individual strategic property as parameter δ. When individual consumers are more patient, δ is larger. Apparently, the purchase decisions of individuals are independent and there exist no interference between myopic and strategic consumers. If we derive the analysis just within the consumer group, the conclusion is kind of counterintuitive. Nevertheless, if we include the reaction of a monopolistic seller, the result becomes easier to realize. We use b, δ, p to express “buy or not”, “consumer patience”, and “pricing strategies”; and the actions nearly happening at the same time are described as follows:(i) In the beginning, myopic consumers only have the buy-or-not decision, denoted asM(b). And the strategic consumers have one more characteristic parameter, consumer patience δ, denoted as S(b,δ).(ii) The seller who has one variable (denoted asF(p)) realizes the change and chooses to lower first-period price and raise the second-period price.(iii) Both myopic and strategic consumers decrease the demand of purchase.The pricing strategies during rise of consumer patience have been proved in AppendixA. In a nutshell, increase of customer patience δ will contribute less demand of not only strategic but also myopic consumers.Proposition 7.
Whenθ>2.768δ2-6.1046δ+3.3512, there exists a profit diversion, and there is no profit diversion otherwise.When there is a cost reductionα=0.01, we try different valuation of proportion of strategic consumers as in Figure 5, and from above expected profit in first period always decreases and expected profit in second period increases. As a result, the total profit π2s∗ is decreasing. Further, we can clearly find the moderating effect of customer patience, which enables the expected profit steeper under a higher valuation of customer patience. And the relationship between proportion of strategic consumers and pricing strategies has been conducted in Proposition 7.Figure 5
Relationship between proportion of strategic consumersθ and seller’s expected profit.
(a)
Relationship whenδ=0.3,c=0.5 (b)
Relationship whenδ=0.7,c=0.5Another observation is that when there exists a relatively high customer patience, the profit diversion occurs. This diversion can be easily found in Figure5 after comparison between different combinations of θ and δ. A similar revenue diversion finding can be read in the study by Kremer [25], where he performs a behavioral experiment. In that experiment, when he gives the proportion of strategic consumers of 0.5, he finds theoretically that most of the expected revenue has been diverted into the second season. Nevertheless, in our findings, the proportion of strategic consumers is just one of the properties of the whole consumer group that contribute to the revenue diversion. In our research,we give two dimensions to depict that, which are proportion of strategic consumers and customer patience. By controlling different combination of θ and δ, the profit diversion will be more significant when θ and δ are higher in the combination.To prove this, we derive a numerical study as shown in Table2.Table 2
Expected minimum profit under different unit cost of TA.
range δ 0.01 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0.99 θ NA NA NA NA NA 1 0.67 0.43 0.25 0.11 0.01  range  δ 0.99 0.91 0.83 0.77 0.71 0.67 0.63 0.59 0.56 0.53 0.5 θ 0.01 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0.99 NA: out of range (0,1). Numbers in italics: values approaching boundary.We chooseθ from 0 by 0.1 to 1, where we use 0.01 to replace 0 and use 0.99 to replace 1; and we choose δ the same as that of θ. Further, we derive the solution of the appearance point of revenue diversion, listed in Table 2. As a result, we depict a fitting curve to approach the successive condition. We got fitting equation of θ=2.768δ2-6.1046δ+3.3512 with test of agreement R2=0.9993. The fitting curve has been shown in Figure 6.Figure 6
Conditional existence of revenue diversion.According to our finding, there exists revenue diversion (π1<π2) when customer patience and proportion of strategic consumers have relatively high value. This means when there are more strategic consumers in the market or the extent of consumers is more strategic, the seller’s profit will shift to the second period. Furthermore, this finding indicates that the seller should pay more attention to the second period including pricing and sales strategies. Additionally, research like sampling is necessary to protest the consumer properties, particularly proportion of strategic consumers and customer patience. And when profit diversion happens, out of the flexibility of dynamic pricing, the seller may be lucrative than in other pricing strategies, like price commitment and price matching.Another observation is that consumer patience has more robustness than proportion of strategic consumers, which is easy to see in Figure6. Further, according to our research, revenue diversion will not happen as far as the value of customer patience is under 0.5. In other words, customer patience may be more influencing than proportion of strategic consumers.Corollary 8.
The pricing and sales strategy will differ under different combination of consumer constituent and consumer patience. Particularly, in our analysis, the indifferent condition can be expressed asθ=2(1-δ)/δ.Once facing cost reduction, maybe resulting from TA, the ordinary decision for the firm is to decrease the price and attract more demand and, as a result, reach a new equilibrium where the total profit will increase. However, our research gets new findings, contrary to conventional wisdom, which motivate researchers to consider the properties of consumer group. From our research, we consider the properties from two dimensions, proportion of strategic consumersθ and consumer patience δ, to picture consumers. That is, under different combination of proportion and consumer patience, the pricing and sales strategy differ with the change of TA extent, especially in the second period. This requires sellers to pretest and analyze the population properties before making strategic decisions. Similar counterfactual findings of different impacts from different market structures were also reported by Li et al. [4]. In the research of air-travel industry, they give some valuable conclusions that different pricing strategies should be implemented in different markets, like leisure market and business market, to maximize profit.


## 4.1. Impact of Cost Reduction

Now we turn to the influence of cost reduction under dynamic pricing strategy. Cost reduction may come from a reduction in the variable cost with technology improvement. This kind of cost reduction is independent of sales in the former period. In this section, we consider the impact of cost reduction on pricing policy and expected profit in Proposition3 and sales in Proposition 4.Proposition 3.
Impact of technology advancementα on firm’s pricing and expected profit:
(1) For the optimal price in the first stage,∂p1∗/∂α>0, while for the optimal price in the second period, ∂p2∗/∂α>0 when θ>2(1-δ)/δ, and ∂p2∗/∂α≤0 when θ≤2(1-δ)/δ.
(2) For the firm’s expected profit,∂π2s∗/∂α>0.When there exists cost reduction, the firm always has a strong incentive to stimulate the later demand because of the higher marginal profit in the second period when facing technology advancement. So it is easy to understand why sellers tend to increase the first-period price. However, this results in the second-period pricing strategy bias. In other words, the optimal price in the second period is conditionally increasing inα (or conditionally decreasing in α).We select different value ofδ and θ to derive the indifference curve of the condition which reverses the optimal pricing trend in the second period. When satisfying the condition θ<2(1-δ)/δ (or Area 1), seller should lower the price, and when θ>2(1-δ)/δ (or Area 2), seller should raise the price.When facing the cost reduction in the latter period, the firm normally increases the first-period price to make much demand shift from period 1 to period 2. Then the second-period market will reach a new equilibrium where demand becomes higher and price becomes lower compared with the former equilibrium. These ordinary changes can always be read in managerial economic books, such as Png [35]. Nevertheless, our finding seems to be counterintuitive. That is, raising second-period price is not always the optimal strategy in the reaction of the cost reduction. However, it depends. When the proportion of strategic consumers in the market is less than the criteria, θ<2(1-δ)/δ, the increase of cost reduction will push the seller to lower the price; when it is more than that, θ>2(1-δ)/δ, the increase of cost reduction will motivate the seller to raise the price. And this critical boundary has been illustrated in Figure 2. Or we can conclude it as increase of the second-period price depending on the constituent of consumers. Therefore, it is vital for the company to figure out the constituent before making the second-period pricing strategy.Figure 2
Second-period pricing strategy with condition under cost reduction. Note. Area 1,θ<2(1-δ)/δ; Area 2, θ>2(1-δ)/δ.Another observation is that no matter what the proportion of strategic consumers in the market is, the total profit is always ascendant with the rise of technology advancement. On the one hand, the increasing trend of profit is not surprising, because the technology advancement improves the marginal profit. On the other hand, it is a little out of common sense that the firm should implement the technology innovation as possible as it can. The reason is that we do not take the expense of technology advancement (used to be fixed cost) into consideration. If we add the fixed costfc to the profit condition, then the result would differ. When considering the fixed cost, the profit with the rise of technology innovation will be decreasing in the beginning and increasing in the end. This relationship between fixed cost and profit can also be read in [35] by Png. And we simply conduct several groups of numerical experiments to confirm this point of view.Proposition 4.
Impact of technology advancementα on demand (sales):
(1) For the demand in the former period,∂Q1/∂α<0, and for the demand in the latter stage, ∂Q2/∂α>0. And the total demand can be increasing or decreasing in α: ∂Q/∂α>0 when θ<2(1-δ)/δ, and ∂Q/∂α≤0 otherwise.
(2) The demand of both myopic and strategic consumers can be increasing or decreasing inα: ∂Qm/∂α>0 and ∂Qs/∂α>0 when θ<2(1-δ)/δ, or ∂Qm/∂α≤0 and ∂Qs/∂α≤0 otherwise.It is easy to understand the shifts where consumers tend to decrease the purchase in the first period and increase the purchase in the second period, because of the optimal pricing strategy, which has been the finding in Proposition4, in addition to the total demand bias under the different constituent of consumers (as shown in Figure 3), which is similar to the findings in Proposition 4. That is, when there is greater proportion of strategic consumers in the market, the total sales will decrease and increase otherwise. More consumers choose to wait. This is especially true when the technology advancement effect is significant. Thus, in this situation, a large demand will be transferred to next period. Then the pricing strategy in the second period matters; as a result, the total demand of product will increase in α when θ<2(1-δ)/δ and decrease otherwise.Figure 3
Moderation effect from combination ofθ and δ.If we divide the demand depending on different consumer segments, the other observation is that both myopic and strategic demand will increase inα when θ<2(1-δ)/δ and decrease otherwise. On the one hand, for myopic consumers, it is the decrease of the second-period price that contributes to the rise of total demand of myopic consumers when facing the lower proportion of strategic consumers (price shifts have been proved in Proposition 3). On the other hand, for strategic consumers, the demand will increase because of the lower price in second period without customer constituent change. In conclusion, customer constituent has a moderation impact on the relationship between technology advancement effect and both myopic and strategic demand. This meaningful finding reminds the company that the constituent analysis and patience investigation of consumers are necessary before operating a technology advancement task.


## 4.2. Impact of Strategic Consumer Proportion

After recognition of cost reduction impact, now we turn to the influence of strategic consumer proportion. This ratio, which reflects the constituent of consumers in targeted market, turns out to be very important for policy makers especially when facing forward-looking customers. The influence is directly exerted on pricing and sales policies and, as a result, on optimal profit. In this section, we provide some insights into optimal solutions when considering the impact of strategic consumer proportion. In particular, we first consider the impact on expected sales in Proposition5.Proposition 5.
Impact of the proportion of strategic consumersθ on demand (sales):
(1) The demand for the first stageQ1∗ is decreasing in θ, but the demand for the second stage Q2∗ is increasing in θ. Anyway, the total demand Q1∗+Q2∗ will be decreasing in θ.
(2) The difference between two-stage demandQ2∗-Q1∗>0 if and only if c<θ(2-δ)/(δθ+2-2δ), and ∂(Q2∗-Q1∗)/∂θ>0.
(3) If divided by consumer segmentation,∂Qm/∂θ<0 and ∂Qs/∂θ>0.Figure4 illustrates how proportion of strategic consumers influences the demand, when δ=0.7, c=0.5. Note that cost reduction from technology used to have a relatively low extent of impact on cost reduction, and we set α=0.01. From Figure 4(a), with increase in θ, the demand for the first period decreases, but the one for second period increases. We can also find that the total demand decreases, and the difference between two stages becomes larger.Figure 4
Impact of the proportion of strategic consumerθ on demand (sales).
(a)
By different purchasing stages (b)
By different customers segmentsFrom Figure4(b), with the increase in θ, the total demand of strategic customers increases and demand of myopic customers decreases. However, the total demand will increase.If we divide the total sales by different purchasing stages, it is better for the firm to sell less products in the first period and more in the second period, with increase of strategic consumers proportion. With significant technology advancement effect, consumers will have a strong incentive to wait. Also, the rise in the proportion of strategic consumers may lead to more consideration of the trade-off between two purchasing stages. The company should provide a significant cutoff on the first-period price to weaken the incentive, which may contribute a bigger profit loss than that when just letting them delay the purchase. In addition, the firm may prefer more customers to wait because the significant technology advancement effect raises up the profit margin of product in the latter period.The total demand decreases, which can be interpreted by the fact that the increase in the second-period demand cannot make up the fall in the first-period demand. This can be proved by the difference between two period salesQ2∗-Q1∗ decreasing in θ. When facing the cost reduction, more strategic consumers would delay their purchase as we discuss above and part of them will give up their purchase. The former choice will transfer the demand from first period to second; however the latter situation contributes to loss of customers. On the one hand, the strategic consumers whose valuation vs<v- (according to Lemma 1.) would have made purchase decision in the first period, but the message of cost reduction may mislead them, which induces more consumers to wait until the second period. On the other hand, the firm will increase the price in the second period to improve the profit. The strategic consumers lose the product availability and purchasing opportunities in the first period. In this situation, especially the strategic consumers will lose the freedom of when to buy and only have the choice of whether or not to buy. Besides raising up the second-period price, firm can decrease the first-period price to improve profit, which will be further discussed next.Additionally, if we divide the total sales depending on different consumer segments, the sales from myopic consumers will decline sharply and the sales from strategic consumers will rise. This is mainly because the proportion of strategic consumers increases. As a result, the firm should pay more attention to and make specific strategies targeting the strategic consumers.Similarly, we have also conducted the robustness analysis on the impact of the proportion of strategic consumersθ on firm’s pricing and expected profit:( 1 )   p 1 ∗ is decreasing in θ and p2∗ is increasing in θ. However, the reduction range p1∗-p2∗ decreases in θ.( 2 ) The expected profit for the first period is decreasing in θ, and the expected profit for the second period is increasing in θ. However, the total profit of company π2s∗ is decreasing in θ.As we have mentioned above, the increase in proportion of strategic consumers means more strategic consumers such that they will consider their surplus from purchasing the product and make a trade-off between two stages to maximize their surplus. This may worry the firm in that the sales in the first period where the marginal profit is relatively higher will drop, which motivates the firm to reduce the first-period price to retain more consumers making purchase decision in the former stage and weaken the trend of transferring demand to second period. On the contrary, the company may have motivation to attract strategic consumers to the second period. In the second period, the strategic consumers only have the purchase decision of whether to buy, and lose the freedom of timing their purchase stages. As a result, the firm may raise up the selling price to maximize their profit. What is more, the difference between the prices in two stages will decrease with the rise of strategic consumers. This is easy to explain because of the opposite shift directions of two-stage prices.Actually, we get the conclusion that the first-period price should descend with more strategic consumers in the market. It really concerns us that there is still some motivation behind raising the price in the former stage, that is, the influence of cost reduction. With massive selling quantity, each dollar of cost reduction would make the seller more rubricate. This may indicate that more demand, especially strategic demand, met in the second period benefits the seller where higher marginal profit happens with the significant technology advancement. This counterintuitive finding can also be read in the studies by Kremer [25] and Shum et al. [5].Furthermore, the expected profit will go up in the first period and go down in the second period. This keeps pace with the change of price which is lower in the beginning and higher in the end. In addition to the reason of price, we cannot ignore the shifts in sales. More strategic consumers choose to delay the purchase until the second period. These two reasons explain why the expected profit is up sooner but down later. Moreover, the total profit will decrease when facing more forward-looking consumers in the market. On the one hand, the total sales quantity decreases, which can be found in Proposition5(1). On the other hand, the firm should increase the first-period price and decrease the second-period price, which makes it hard for us to tell whether the average profit will decrease or not. However, the potential motivation we talked about above may help explain the decrease of the total profit.


## 4.3. Impact of Customer Patience

Customer patience, in a way, can be viewed as waiting cost, according to Su [9]. This usually measures the extent of willingness to wait, for strategic consumers. In addition to the quantitative effect of strategic consumer proportion, it is another dimension to study the characteristic of market. We provide insights into the optimal solution for operational policies makers particularly when facing heterogeneous strategic consumers. This part focuses on the surprising impact of customer patience, as a property belonging to strategic consumers, on myopic demand in Proposition 6. Moreover, we cast light on the relationship between strategic consumer proportion and customer patience in Proposition 7, especially when maximizing the expected profit. The numerical study also examines the robustness of both these parameters.Sharing the similarity with the robustness analysis of strategic consumers proportion, we also perform the analysis of customer patience. First, the analysis suggests the following:( 1 ) The demand for the first stage Q1∗ is decreasing in δ, but the demand for the second stage Q2∗ is increasing in δ. Anyway, the total demand Q1∗+Q2∗ will be decreasing in δ.( 2 ) The difference between two-stage demand Q2∗-Q1∗>0 if and only if c<θ(2-δ)/(δθ+2-2δ), and ∂(Q2∗-Q1∗)/∂δ>0.In addition, we conduct the analysis of customer patienceδ on firm’s pricing and expected profit:( 1 ) Let p1∗ and p2∗ be the equilibrium prices. Then p1∗ is decreasing in δ and p2∗ is increasing in δ. However, the reduction range p1∗-p2∗ decreases in δ.( 2 ) The expected profit for the first period is decreasing in δ, and the expected profit for the second period is increasing in δ. However, the total profit of company π2s∗ is decreasing in δ.These results share so much similarity with the analysis for strategic consumers proportion, and that can be explained by the negative effect of strategic properties. However, according to our analysis, there also exist some counterintuitive findings of customer patience, which is relatively different from strategic proportion. And these findings will be shown in Proposition6.Proposition 6.
With the increase of customer patienceδ, not only strategic but also myopic consumers will buy less (∂Qm/∂δ<0, ∂Qs/∂δ<0).We describe proportion of strategic consumers as parameterθ and individual strategic property as parameter δ. When individual consumers are more patient, δ is larger. Apparently, the purchase decisions of individuals are independent and there exist no interference between myopic and strategic consumers. If we derive the analysis just within the consumer group, the conclusion is kind of counterintuitive. Nevertheless, if we include the reaction of a monopolistic seller, the result becomes easier to realize. We use b, δ, p to express “buy or not”, “consumer patience”, and “pricing strategies”; and the actions nearly happening at the same time are described as follows:(i) In the beginning, myopic consumers only have the buy-or-not decision, denoted asM(b). And the strategic consumers have one more characteristic parameter, consumer patience δ, denoted as S(b,δ).(ii) The seller who has one variable (denoted asF(p)) realizes the change and chooses to lower first-period price and raise the second-period price.(iii) Both myopic and strategic consumers decrease the demand of purchase.The pricing strategies during rise of consumer patience have been proved in AppendixA. In a nutshell, increase of customer patience δ will contribute less demand of not only strategic but also myopic consumers.Proposition 7.
Whenθ>2.768δ2-6.1046δ+3.3512, there exists a profit diversion, and there is no profit diversion otherwise.When there is a cost reductionα=0.01, we try different valuation of proportion of strategic consumers as in Figure 5, and from above expected profit in first period always decreases and expected profit in second period increases. As a result, the total profit π2s∗ is decreasing. Further, we can clearly find the moderating effect of customer patience, which enables the expected profit steeper under a higher valuation of customer patience. And the relationship between proportion of strategic consumers and pricing strategies has been conducted in Proposition 7.Figure 5
Relationship between proportion of strategic consumersθ and seller’s expected profit.
(a)
Relationship whenδ=0.3,c=0.5 (b)
Relationship whenδ=0.7,c=0.5Another observation is that when there exists a relatively high customer patience, the profit diversion occurs. This diversion can be easily found in Figure5 after comparison between different combinations of θ and δ. A similar revenue diversion finding can be read in the study by Kremer [25], where he performs a behavioral experiment. In that experiment, when he gives the proportion of strategic consumers of 0.5, he finds theoretically that most of the expected revenue has been diverted into the second season. Nevertheless, in our findings, the proportion of strategic consumers is just one of the properties of the whole consumer group that contribute to the revenue diversion. In our research,we give two dimensions to depict that, which are proportion of strategic consumers and customer patience. By controlling different combination of θ and δ, the profit diversion will be more significant when θ and δ are higher in the combination.To prove this, we derive a numerical study as shown in Table2.Table 2
Expected minimum profit under different unit cost of TA.
range δ 0.01 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0.99 θ NA NA NA NA NA 1 0.67 0.43 0.25 0.11 0.01  range  δ 0.99 0.91 0.83 0.77 0.71 0.67 0.63 0.59 0.56 0.53 0.5 θ 0.01 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0.99 NA: out of range (0,1). Numbers in italics: values approaching boundary.We chooseθ from 0 by 0.1 to 1, where we use 0.01 to replace 0 and use 0.99 to replace 1; and we choose δ the same as that of θ. Further, we derive the solution of the appearance point of revenue diversion, listed in Table 2. As a result, we depict a fitting curve to approach the successive condition. We got fitting equation of θ=2.768δ2-6.1046δ+3.3512 with test of agreement R2=0.9993. The fitting curve has been shown in Figure 6.Figure 6
Conditional existence of revenue diversion.According to our finding, there exists revenue diversion (π1<π2) when customer patience and proportion of strategic consumers have relatively high value. This means when there are more strategic consumers in the market or the extent of consumers is more strategic, the seller’s profit will shift to the second period. Furthermore, this finding indicates that the seller should pay more attention to the second period including pricing and sales strategies. Additionally, research like sampling is necessary to protest the consumer properties, particularly proportion of strategic consumers and customer patience. And when profit diversion happens, out of the flexibility of dynamic pricing, the seller may be lucrative than in other pricing strategies, like price commitment and price matching.Another observation is that consumer patience has more robustness than proportion of strategic consumers, which is easy to see in Figure6. Further, according to our research, revenue diversion will not happen as far as the value of customer patience is under 0.5. In other words, customer patience may be more influencing than proportion of strategic consumers.Corollary 8.
The pricing and sales strategy will differ under different combination of consumer constituent and consumer patience. Particularly, in our analysis, the indifferent condition can be expressed asθ=2(1-δ)/δ.Once facing cost reduction, maybe resulting from TA, the ordinary decision for the firm is to decrease the price and attract more demand and, as a result, reach a new equilibrium where the total profit will increase. However, our research gets new findings, contrary to conventional wisdom, which motivate researchers to consider the properties of consumer group. From our research, we consider the properties from two dimensions, proportion of strategic consumersθ and consumer patience δ, to picture consumers. That is, under different combination of proportion and consumer patience, the pricing and sales strategy differ with the change of TA extent, especially in the second period. This requires sellers to pretest and analyze the population properties before making strategic decisions. Similar counterfactual findings of different impacts from different market structures were also reported by Li et al. [4]. In the research of air-travel industry, they give some valuable conclusions that different pricing strategies should be implemented in different markets, like leisure market and business market, to maximize profit.


## 5. Conclusion

Cost reduction induces the company to adjust its pricing strategies to accommodate the demand shifts in the market of both strategic and myopic consumers. Under cost reduction resulting from technology advancement, we investigate the impact from strategic behavior. We find that both proportion of strategic consumers and consumer patience will contribute to a more strategic identity of consumers collectively and individually. This means when consumers, especially strategic ones, face cost reduction, they tend to delay their purchase and wait until the second period. Thus, the seller will react to decrease the first-period price to weaken this trend. And the second-period pricing strategy is easy to realize with a rise to slow down this shift. However, another incentive for seller to increase the second-period price is to raise profit. This can be depicted as “rob the owner while his house is on fire”. In this situation, especially the strategic consumers who lose the freedom of when to buy only have the choice of whether to buy. Furthermore, when facing great enough proportion of strategic consumers (or customer patience), profit diversion will happen, which means the profit from the latter period exceeds the one from the first period. Under profit diversion, dynamic pricing strategy enable the seller to squeeze more consumer surplus in the second period because it decreases the uncertainty when strategic consumers are going to purchase.In addition, with the increase of customer patience, not only strategic but also myopic consumers will buy less. This counterintuitive finding can also result from the mediation effect of pricing strategy. In case of serious strategic waiting, the firm chooses to decrease the markdown on second-period price, which contributes to the reduction of both strategic and myopic total demand.Other than that, we also investigate the impact of cost reduction as an endogenous variable. In this paper we assume that cost reduction arises out of TA; however, Jin [30] and Hatch [36] investigate the production learning effect and also take it as an important factor in cost reduction. In our research, surprisingly there exists a threshold as a combination of proportion of strategic consumers and consumer patience. When proportion of strategic consumers exceeds a threshold, the seller will provide a higher second-period price when facing the cost reduction, and a lower one otherwise. This conclusion on pricing also accounts for the counterintuitive findings in demand. These discoveries above are declared in models for the first time, yet former researches have been a notable success in dynamic pricing. Shum [5] compared three different pricing strategies, which are dynamic pricing, price commitment, and price matching. There are also empirical studies that may support our conclusion, like that of Li [4]. From Li’s study about the total strategic property of consumers in a certain market, it was indicated that under different strategic extent, the estimation of proportion of strategic consumers differs. Thus, it is necessary for the company to figure out the constituent and consumer patience before making the second-period pricing strategy. Maybe it is feasible to make sampling survey or conduct data analysis of the consumers’ relative shopping tracks.Our study also has limitations which, in turn, are opportunities for future researches. First, we have not taken expenses of TA into consideration, which are usually a fixed cost. This may lack the analysis of the shut-down point of TA, which means TA strategy should be abandoned when it is too costly. The lack contributes to the conclusion that seller needs as much TA as possible, which is counterfactual. In addition, we just study the reaction of buyer and seller under single pricing strategy; besides there are still price commitment and price matching strategies in ordinary studies among revenue management. Those strategies have been studied by Aviv [11] and Su [37]. Furthermore, future studies could not only study the cost reduction under dynamic pricing but also make the comparison among three pricing strategies. Finally, the situation may be more complicated when facing both intertemporal pricing strategies and competitions among sellers. Multiple researchers have paid attention to that, like Liu [12] in rationing risk and Su [37] in supply chain performance.



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*Source: 3272875-2019-06-25.xml*