# Research on the Competitive Strategy of Cross-Border E-Commerce Comprehensive Pilot Area Based on the Spatial Competition

Authors: Bo Lu; Huipo Wang
Journal: Scientific Programming
 (2016)

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## Abstract

By now, 13 cross-border e-commerce comprehensive pilot areas have been approved by the State Council of China; Dalian and Tianjin are two of them. But with the development of the construction of the cross-border e-commerce comprehensive pilot areas, the competition between those pilot areas is inevitable. Dalian and Tianjin are located in the Bohai Sea and the distance between them is only 800 kilometers. For Dalian and Tianjin they are in thus competitive situations: first they have to compete with each other; second since they are located in Bohai Sea (North China), they have to compete with other cross-border e-commerce comprehensive pilot areas (South China). In this paper, our aim is to build models to provide best price strategies for these two cities. Based on the two-sided market theory and the geographical position, this paper builds two competitive theory models. Through the analyzing of the equilibrium, we get two main results: (1) according to different service area, the cities (Dalian and Tianjin) should have different price; (2) the two-sided market characters have an impact on their strategies.


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## Body

## 1. Introduction

In March 2015, the State Council established the first comprehensive pilot area of cross-border e-commerce in Hangzhou. Within one year, the transaction scale of cross-border e-commerce in Hangzhou increased from 20 million dollars in 2014 to 3.464 billion dollars in 2015, including exports accounting for 2.273 billion dollars and imports accounting for 1.191 billion dollars, which contributed 5.4% for the growth of foreign trade exports in Hangzhou. The establishment of the comprehensive pilot area of cross-border e-commerce in Hangzhou has yielded prominent results. In January 2016, the State Council decided to set up a group of new comprehensive pilot areas of cross-border e-commerce in 12 cities such as Tianjin and Shanghai, and the intention of this decision was to take example by the efficient pattern of comprehensive pilot area in Hangzhou to provide the development of Chinese foreign trade with new motivations and supports [1, 2]. But with the development of the construction of the cross-border e-commerce comprehensive pilot area, the competition between those pilot areas is inevitable. And this kind of competition has obvious spatial characteristics and two-sided market characteristics.This article takes Tianjin and Dalian as an example to illustrate the competition among the cross-border e-commerce comprehensive pilot areas. Both Tianjin and Dalian are the second batch of the establishment of cross-border e-commerce comprehensive pilot areas in the beginning of 2016. Both of them are located in the north of China. Tianjin is in the west and Dalian is in the east. This kind of layout just divides the domestic enterprises and consumers into four parts, as shown in Figure1.Figure 1
Location map of domestic firms and consumers.The following analysis can be done through the angle of the geographical position: first, because Tianjin is located in the west, Dalian is located in the east. So firms and consumers in the west of Tianjin will take Tianjin as the first choice to do cross-border e-commerce; the firms and consumers in the east of Dalian will take Dalian as the first choice to do cross-border e-commerce. At the same time the firms and consumers in the south of Dalian Tianjin line can choose Tianjin and Dalian or can also choose other comprehensive pilot areas, for example, Qingdao and Zhengzhou. Therefore, A district is under the competition of multiareas. The firms and consumers in the north of Dalian Tianjin line can only choose Dalian or Tianjin. Therefore, B district is under the competition of Dalian and Tianjin. In summary, there is no competition in C and D zones, and A and B zones are the competition zones. Therefore, this paper will analyze the competitive strategy of cross-border e-commerce comprehensive pilot areas based on spatial competition theory.Besides, the cross-border e-commerce comprehensive pilot areas are service platforms; on the one hand, they are connecting the domestic firms and consumers, and on the other hand, they are connecting the foreign firms and consumers, so the market is typically a two-sided market [3, 4].Until now there is no general agreement on a standard definition of two-sided market, but the definitions of Armstrong (2006) [5], Rysman (2009) [6], and Rochet and Tirole (2010) [7] are widely cited and recognized. Coase theorem and the nonneutrality of price structure are two significant features of the two-sided markets. Rochet and Tirole (2010) [7], Armstrong (2006) [5], Kaiser and Wright (2006) [8], and other scholars have proposed their own classification of two-sided market, but the classification of Evans (2003) is widely accepted. He divided the two-sided market into three classifications: market-makers, audience-makers, and demand-coordinators [9]. Cross-border e-commerce comprehensive pilot areas are platforms to do cross-border e-commerce, so they have the main characteristics of two-sided market. In this paper we use two-sided market theory to build the theory model.Through the above analysis, we know that the firms and consumers in C zone will take Tianjin as the first choice to do cross-border e-commerce; the firms and consumers in D zone will take Dalian as the first choice to do cross-border e-commerce. So there is no need to analyze their strategies on zones C and D. Then, in this paper, we will build two competitive theory models to analyze Dalian and Tianjin’s competitive strategies on zone A and zone B, respectively. Also, we will analyze how the two-sided market characteristics affect the revenue of those two cities. Although the model takes Tianjin and Dalian as an example, the conclusions are general.The paper is organized as follows: the first part is Introduction, the second part is The Basic Model Assumptions, the third part is Model (I): Competitive Model on A Zone, the fourth part is Model (II): Competitive Model on B Zone, the fifth part makes A Comparative Analysis of Model (I) and Model (II), the sixth part shows some numerical examples, and the seventh part makes the conclusion.


## 2. The Basic Model Assumptions

For the convenience of analysis, in this paper, the fundamental assumptions are as follows. Firstly, we assume that there are two kinds of pilot areas: the first one is called the North area, which includes Tianjin and Dalian; the other one is called the South area, which includes other eleven cities. In the North area there are two cities: Tianjin is referred to as positioni, and Dalian is referred to as position j. Secondly, hypotheses about the two-sided markets are as follows: the domestic firms and consumers (DF&Cs for short) are called side 1 and the foreign firms and consumers (FF&Cs for short) are called side 2. According to the actual situation, the DF&Cs side is single-homing and the FF&Cs side is multihoming. We assume that t1 is the matching cost (which includes the transportation cost and other costs) of side 1 and t2 is the matching cost of side 2, and matching cost of side 1 is equal to that of side 2; namely, t1=t2=t. Thirdly, the hypotheses of network effects are as follows: we assume that there are network effects between groups. The strength of network effects for DF&Cs side gathering in the position i to FF&Cs side is α12i; the strength of network effects for DF&Cs side gathering in the position j to FF&Cs side is α12j. The strength of network effects for FF&Cs side gathering in the position i to DF&Cs side is α21i; the strength of network effects for FF&Cs side gathering in the position j to DF&Cs side is α21j. Thus, the strength of network effects between groups is α12i,α12j,α21i,α21j. Under the premise of not influencing the analysis conclusion, we assume that the strength of network effects between groups is equal to α. Fourth, we assume that the reservation utility of side 1 DF&Cs takes the position i as their operating location is u-1i; the reservation utility of side 1 DF&Cs takes the position j as their operating location is u-1j; the reservation utility of side 2 FF&Cs takes the position i as their operating location is u-2i; the reservation utility of side 2 FF&Cs takes the position j as their operating location is u-2j. For side 2 FF&Cs, the function of taking ll∈i,j position as their operating location can be separated into the function of quality m and the function of price k, because the FF&Cs are maybe multihoming. Only multifunction can lead to multihoming. There is no necessary to separate the function of DF&Cs into quality function and price function because the DF&Cs side is single-homing. Accordingly, u-2i=u-2mi+u-2ki,u-2j=u-2mj+u-2kj (where u-2mi is the utility of quality function m of side 2 FF&Cs that take the position i as their operating location; u-2mj is the utility of quality function m of side 2 FF&Cs that take the position j as their operating location; u-2ki is the utility of price function k of side 2 FF&Cs that take the position i as their operating location; u-2kj is the utility of price function k of side 2 FF&Cs that take the position j as their operating location). According to the actual situation, u-2mi>u-2mj,u-2kj>u-2ki. (For Tianjin is more big and international than Dalian, its service quality is high compared to Dalian, but Dalian can provide a lower service price.) p1i,p1j represent the cost (price) of DF&Cs that take the positions i,j as their operating location, respectively.


## 3. Model (I): Competitive Model on A Zone

The market is an oligopoly competition market when the North area and the South area are competing for the firms and consumers from A zone. For the North area, Model (I) diagram is shown as in Figure2. In oligopoly competition market, the DF&Cs can choose to take the North area or the South area as their operating location. In this model the DF&Cs in [x1,x2] do not take the North area as their operating location; they take the South area as their operating location.Figure 2
Model (I): Competitive Model on A Zone.Description of the notations in Figure2 is as follows: i: Tianjin; j: Dalian; n1i: the DF&Cs who take position i as their operating location; x1: the edge DF&Cs; n1j: the DF&Cs who take position j as their operating location; x2: the edge DF&Cs; n2i: the FF&Cs who take position i as their operating location only; y1: the edge FF&Cs; N2i: the FF&Cs who take position i only or take positions i,j as their operating location; y2: the edge FF&Cs; n2j: the FF&Cs who take position j as their operating location only; y2:the edge FF&Cs; N2j: the FF&Cs who take position j only or take positions i,j as their operating location; y1: the edge FF&Cs.The utility of the DF&Cs who take positioni as their operating location is(1)u1i=u-1i-p1i-tx1+αy2.The utility of DF&Cs is 0 if the DF&Cs located betweenx1 and x2, and the DF&Cs will take the South area as their operating location. So(2)u-1i-p1i-tx1+αy2=0.The utility of the DF&Cs who take positionj as their operating location is(3)u1j=u-1j+α1-y1-t1-x2-p1j.The utility of DF&Cs is 0 if the DF&Cs located betweenx1 and x2, and the DF&Cs will take the South area as their operating location. So(4)u-1j+α1-y1-t1-x2-p1j=0.The utility of the FF&Cs who take positioni as their operating location is(5)u2i=u-2i+αx1-ty1.The utility of the FF&Cs who take positionsi and j as their operating locations is(6)u2ij=u-2mi+u-2kj+αx1+1-x2-t.The utility of the FF&Cs who take positionj as their operating location is(7)u2j=u-2mj+u-2kj+α1-x2-t1-y2.LetV1d=u-1i-u-1j,V2d=u-2kj-u-2ki+u-2mi-u-2mj,V2kd=u-2kj-u-2ki,V2md=u-2mi-u-2mj.At pointy1, the FF&Cs who take position i as their operating locations or take positions i and j as their operating locations are indifferent. So(8)u2i=u2ij,u-2i+ax1-ty1=u-2mi+u-2kj+ax1+1-x2-t.Simplifying this function, we can get(9)y1=u-2ki-u-2kjt-at+ax2t+1.At pointy2, the FF&Cs who take position j as their operating locations or take positions i and j as their operating locations are indifferent. So(10)u2j=u2ij,u-2mj+u-2kj+a1-x2-t1-y2=u-2mi+u-2kj+ax1+1-x2-t.Simplifying this function, we can get(11)y2=u-2mi-u-2mjt+ax1t.Substituting (11) into (2), we can get(12)u-1i+au-2mi-u-2mjt+ax1t-tx1-p1i=0.Simplifying this function, we can get(13)x1=tt2-a2u¯1i-p1i+au-2mi-u-2mjt.From Figure2, we know that(14)x1=n1i.So(15)n1i=tt2-a2u-1i-p1i+au-2mi-u-2mjt.Substituting (9) into (4), we can get(16)u-1j+aat-ax2t-u-2ki-u-2kjt-t+tx2-p1j=0.Simplifying this function, we can get(17)x2=1-tt2-a2u-1j-p1j-au-2ki-u-2kjt.From Figure2, we know that(18)n1j=1-x2.So(19)n1j=tt2-a2u-1j-p1j-au-2ki-u-2kjt.Profit function is(20)π=n1i·p1i+n1j·p1j=tt2-α2u-1ip1i-p1i2+αV2mdtp1i+u-1jp1j-p1j2+αV2kdtp1j.πis the function of p1i,p1j, take the first-order derivative of p1i and p1j, and the reaction functions are(21)∂π∂p1i=tt2-α2u-1i-2p1i+aV2mdt,∂π∂p1j=tt2-α2u-1j-2p1j+aV2kdt.Let the reaction functions be zero, and the Bertrand-Nash equilibrium prices are(22)p1i=12u-1i+α2tV2md,(23)p1j=12u-1j+α2tV2kd.Whent>α,∂π2/∂p1i2<0,∂π2/∂p1j2<0, p1i and p1j are the solutions when π is maximization.Lemma 1.
The user scale of the DF&Cs who take positioni as their operating location is n1i=t/2t2-α2u-1i+α/tV2md, the user scale of the DF&Cs who take position j as their operating location is n1j=t/2t2-α2u-1j+α/tV2kd, the user scale of the FF&Cs who take position i only or take positions i,j as their operating location is N2i=V2md/t+α/2t2-α2u-1i+α/tV2md, the user scale of the FF&Cs who take position j only or take positions i,j as their operating location is N2j=V2kd/t+α/2t2-α2u-1j+α/tV2kd, the cost (price) of DF&Cs who take the position i as their operating location is p1i=1/2u-1i+α/2tV2md, the cost (price) of DF&Cs who take the position j as their operating location is p1j=1/2u-1j+α/2tV2kd, and the total income of the North area is π=t/4t2-α2u-1i+α/tV2md2+u-1j+α/tV2kd2.Proof.
According to formula (15), n1i=t/t2-a2u-1i-p1i+au-2mi-u-2mj/t; substitute formula (22) into it. Simplify it; then we can get n1i=t/2t2-α2u-1i+α/tV2md.
According to formula (19), n1j=t/t2-a2u-1j-p1j-au-2ki-u-2kj/t; substitute formula (23) into it. Simplify it; then we can get n1j=t/2(t2-α2)u-1j+α/tV2kd.
From Figure2, we know that(24)N2i=y2.
According to formula (11),(25)y2=u-2mi-u-2mjt+ax1t.
We also know thatx1=n1i; substitute n1i=t/2t2-α2u-1i+α/tV2md into formula (11). Simplify it; then we can get(26)N2i=V2mdt+α2t2-α2u-1i+αtV2md.
From Figure2, we know that(27)N2j=1-y1.
According to formula (11)(28)y1=u-2ki-u-2kjt-at+ax2t+1.
We also know thatx2=1-n1j; substitute n1j=t/2t2-α2u-1j+α/tV2kd into formula (9). Simplify it; then we can get(29)N2j=V2kdt+α2t2-α2u-1j+αtV2kd.
According to formulae (22) and (23), p1i=1/2u-1i+α/2tV2md and p1j=1/2u-1j+α/2tV2kd.
Substituting formulae (22) and (23) into formula (20) and simplify them, we can get(30)π=t4t2-α2u-1i+αtV2md2+u-1j+αtV2kd2.


## 4. Model (II): Competitive Model on B Zone

Whenx1 overlaps with x2, Model (II) diagram is shown as in Figure 3. The utility of the DF&Cs who take position i as their operating location is(31)u1i=u-1i-p1i-tx+αN2i.Figure 3
Model (II): Competitive Model on B Zone.The utility of the DF&Cs who take positionj as their operating location is(32)u1j=u-1j-p1j-t1-x+αN2j.The utility of the FF&Cs who take positioni as their operating location is(33)u2i=u-2i+αn1i-ty1.The utility of the FF&Cs who take both positionsi and j as their operating location is(34)u2ij=u-2mi+u-2kj+α-t.The utility of the FF&Cs who take positionj as their operating location is(35)u2j=u-2j+αn1j-t1-y2.At pointx, the DF&Cs who take position i or j as their operating location are indifferent. So(36)u1i=u1ju-1i+aN2i-p1i-tx=u-1j+aN2j-p1j-t1-x.Solving it,(37)x=12+u-1i-u-1j2t+aN2i-N2j2t+p1j-p1i2t.From Figure3, we know that(38)n1i=x.So(39)n1i=12+u-1i-u-1j2t+aN2i-N2j2t+p1j-p1i2t.At pointy1, the FF&Cs who take position i or positions i and j as their operating location are indifferent. So(40)u2i=u2ij,u-2i+an1i-ty1=u-2mi+u-2kj+a-t.Solving it,(41)y1=1+u-2ki-u-2kjt-atn1j.From Figure3, we know that(42)n2i=y1.So(43)n2i=1+u-2ki-u-2kjt-atn1j.At pointy2, the FF&Cs who take position j or positions i and j as their operating location are indifferent. So(44)u2ij=u2j,u-2mi+u-2kj+a-t=u-2j+an1j-t1-y2.Solving it,(45)y2=u-2mi-u-2mjt+an1it.From Figure3, we know that(46)n2j=1-y2,n2j=1+u-2mj-u-2mit-atn1i.Becausen2i+N2j=1 and n2j+N2i=1, N2j=1-n2i and N2i=1-n2j. So N2i-N2j=1-n2j-1-n2i=n2i-n2j. Because n1i+n1j=1, n1j=1-n1i.SubstitutingN2i-N2j into formula (39), we can get(47)n1i=12+u-1i-u-1j2t+an2i-n2j2t+p1j-p1i2t.Becausen2i-n2j=u-2ki-u-2kj+u-2mi-u-2mj/t+an1i-n1j/t, n1i-n1j=n1i-1+n1i=2n1i-1.So(48)n2i-n2j=u-2ki-u-2kj+u-2mi-u-2mjt+at2n1i-1.Substitute formula (48) into formula (47). Solving it, we can get(49)n1i=12+tu-1i-u-1j2t2-a2+au-2ki-u-2kj+u-2mi-u-2mj2t2-a2+tp1j-p1i2t2-a2.Becausen1j=1-n1i, (50)n1j=12-tu-1i-u-1j2t2-a2-au-2ki-u-2kj+u-2mi-u-2mj2t2-a2-tp1j-p1i2t2-a2.Profit functions are(51)πi=n1i·p1i=12+tV1d2t2-α2+α2t2-α2V2md-V2kd+p1jt2t2-α2-p1it2t2-α2·p1i,πj=n1j·p1j=12-t2t2-α2V1d-α2t2-α2V2md-V2kd-p1jt2t2-α2+p1it2t2-α2·p1jπ i is the function of p1i; take the first-order derivative of p1i;πj is the function of p1j; take the first-order derivative of p1j; the reaction functions are(52)∂π1∂p1i=12+t2t2-α2V1d+α2t2-α2V2md-V2kd+p1jt2t2-α2-p1itt2-α2,(53)∂π2∂p1j=12-t2t2-α2V1d-α2t2-α2V2md-V2kd+p1it2t2-α2-p1jtt2-α2.Let the reaction functions be zero, respectively, and the Bertrand-Nash equilibrium prices are(54)p1i=t2-α2t+13V1d+α3tV2md-V2kd,p1j=t2-α2t-13V1d-α3tV2md-V2kd.Whent>α,∂π2/∂p1i2<0,∂π2/∂p1j2<0, p1i and p1j are the solutions when π is maximization.Lemma 2.
The user scale of the DF&Cs who take positioni as their operating location is n1i=1/2+t/6t2-α2V1d+α/6t2-α2V2md-V2kd, the user scale of the DF&Cs who take position j as their operating location is n1j=1/2-t/6t2-α2V1d-α/6t2-α2V2md-V2kd, the user scale of the FF&Cs who take position i only or take positions i,j as their operating location is N2i=α/2t+V2md/t+α/6t2-α2V1d+α2/6tt2-α2V2md-V2kd, the user scale of the FF&Cs who take position j only or take positions i,j as their operating location is N2j=α/2t+V2kd/t-α/6t2-α2V1d-α2/6tt2-α2V2md-V2kd, the cost of DF&Cs who take the position i as their operating location is p1i=t2-α2/t+1/3V1d+α/3tV2md-V2kd, the cost of DF&Cs who take the position j as their operating location is p1j=t2-α2/t-1/3V1d-α/3tV2md-V2kd, and the total income of the North area is π=t2-α2/t+t/9t2-α2V1d+α/tV2md-V2kd2.Proof.
According to formula (49),(55)n1i=12+tu-1i-u-1j2t2-a2+au-2ki-u-2kj+u-2mi-u-2mj2t2-a2+tp1j-p1i2t2-a2.
Substitute formula (54) into it and simplify it. We can get(56)n1i=12+t6t2-α2V1d+α6t2-α2V2md-V2kd.
According to formula (50),(57)n1j=12-tu-1i-u-1j2t2-a2-au-2ki-u-2kj+u-2mi-u-2mj2t2-a2-tp1j-p1i2t2-a2.
Substitute formula (54) into it and simplify it. We can get(58)n1j=12-t6t2-α2V1d-α6t2-α2V2md-V2kd.
From Figure3, we know that(59)N2i=1-n2j.
According to formula (46),(60)N2i=u-2mi-u-2mjt+atn1i.
Substitute formula (56) into it and simplify it. We can get(61)N2i=α2t+V2mdt+α6t2-α2V1d+α26tt2-α2V2md-V2kd.
From Figure3, we know that(62)N2j=1-n2i.
According to formula (43),(63)N2j=u-2kj-u-2kit+atn1j.
Substitute formula (58) into it and simplify it. We can get(64)N2j=α2t+V2kdt-α6t2-α2V1d-α26tt2-α2V2md-V2kd.
According to formula (54), p1i=t2-α2/t+1/3V1d+α/3tV2md-V2kd and p1j=t2-α2/t-1/3V1d-α/3tV2md-V2kd.
Substitute formula (54) into formula (51). Add them and simplify; we can get(65)π=t2-α2t+t9t2-α2V1d+αtV2md-V2kd2.


## 5. A Comparative Analysis of Model (I) and Model (II)

Under normal condition, the reservation utility of side 1 DF&Cs who take the positioni as their operating locations u-1i is much bigger than V1d which is the difference of the utility of DF&Cs who take the position i as their operating locations and the DF&Cs who take the position j as their operating locations. And u-1i is much bigger than V2d which is the difference of the utility of FF&Cs who take the position i as their operating locations and the FF&Cs who take the position j as their operating locations. The relationships are also existing to u-1j,V1d and V2d. So we get Proposition 3.Proposition 3.
Dalian and Tianjin should charge different price to the DF&Cs from zone A and zone B. And the price and total income of the two cities from zone A are higher than those from zone B.Proof.
According to Lemmas1 and 2, one has the following.
From zone A,(66)p1i=12u-1i+α2tV2md,p1j=12u-1j+α2tV2kd,π=t4t2-α2u-1i+αtV2md2+u-1j+αtV2kd2.
From zone B,(67)p1i=t2-α2t+13V1d+α3tV2md-V2kd,p1j=t2-α2t-13V1d-α3tV2md-V2kd,π=t2-α2t+t9t2-α2V1d+αtV2md-V2kd2.
They are different and that means Dalian and Tianjin should charge different price in different zones.
u - 1 i and u-1j are the reservation utility of the two cities; they are absolute values. V1d,V2d,Vmd, and Vkd are the difference value. Under normal condition the difference values are much smaller than the absolute values. So the price and total income of the two cities from zone A are higher than those from zone B.Proposition 4.
When the intensity of cross network effects between the two-sided users increases, the cost of DF&Cs from zone A who take Dalian and Tianjin as operating locations and the total income of the North area from zone A will be increased accordingly.Proof.
(68) ∂ p 1 i ∂ α = V 2 m d 2 t > 0 , ∂ p 1 j ∂ α = V 2 k d 2 t < 0 , ∂ π ∂ α = t u - 1 i + α V 2 m d α u - 1 i + t V 2 m d + t u - 1 j + α V 2 k d α u - 1 j + t V 2 k d 2 t 2 - α 2 2 > 0 .
So the North area can take measures to increase the intensity between cross network effects of two-sided users in order to increase the viscosity between two-sided users and to improve the service experience of two-sided users. Ultimately it can improve the revenue of Dalian and Tianjin.When the differences of quality utilityV2md and price utility V2kd for the FF&Cs who take positions i and j as their operating locations increase, the price and total income of the North area will be increased accordingly. So we get Proposition 5.Proposition 5.
When the differences of quality utility and price utility increase, the price of the DF&Cs from zone A who take North area as their operating locations and the income of the North area from zone A will be increased.Proof.
(69) ∂ p 1 i ∂ V 2 m d = α 2 t > 0 , ∂ p 1 j ∂ V 2 k d = α 2 t > 0 , ∂ π ∂ V 2 m d = t α u - 1 i + α 2 V 2 m d 2 t t - α t + α , ∂ π ∂ V 2 k d = t α u - 1 j + α 2 V 2 k d 2 t t - α t + α .
Whent>α, then we can get: ∂π/∂V2md>0,∂π/∂V2kd>0.The North area can arrange service with bigger difference of quality on Dalian and Tianjin, respectively, so the North area can get more income. For example, compared with providing the same service in Dalian and Tianjin providing difference services in Dalian and Tianjin, the quality utility of the latter is better than the former, and the North area (both Dalian and Tianjin) can get more income.


## 6. Numerical Example

Suppose Dalian and Tianjin face four situations; the set of the characters and the results are shown in Table1.Table 1
The set of the characters and the results.
Characters Situation 1 Situation 2 Situation 3 Situation 4 Zone A Zone B Zone A Zone B Zone A Zone B Zone A Zone B u - 1 i 10.000 10.000 10.000 10.000 10.000 10.000 10.000 10.000 u - 1 j 9.500 9.500 9.500 9.500 9.500 9.500 9.500 9.500 u - 2 m i 1.250 1.250 1.250 1.250 2.050 2.050 1.250 1.250 u - 2 m j 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 u - 2 k i 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 u - 2 k j 1.200 1.200 1.200 1.200 1.200 1.200 1.300 1.300 t 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 a 0.300 0.300 0.500 0.500 0.300 0.300 0.300 0.300  p 1 i 5.038 1.122 5.063 0.992 5.158 1.202 5.038 1.132 p 1 j 4.780 0.698 4.800 0.508 4.780 0.618 4.795 0.688 π 52.994 0.959 64.892 0.828 54.339 1.003 53.152 0.964Comparing the results of zone A and zone B,p1i, p1j, and π are different, and the former is higher than the latter. So Proposition 3 is confirmed.Comparing the results of Situation 1-zone A and Situation 2-zone A with the increasing ofa, p1i, p1j, and π are increasing.Comparing the results of Situation 1-zone A and Situation 3-zone A with the increasing ofV2md, p1i, p1j, and π are increasing. Comparing the results of Situation 1-zone A and Situation 4-zone A with the increasing of V2kd, p1i, p1j, and π are increasing. So Proposition 5 is confirmed.


## 7. Conclusion

Based on the two-sided markets this paper built two theoretical models to analyze the competitive strategy of cross-border e-commerce comprehensive pilot areas of Dalian and Tianjin of the North area. Through the equilibrium results of comparative static analysis, this article draws the following conclusions.(1)
Dalian and Tianjin should charge different price to the DF&Cs from zone A and zone B. And the price and total income of the two cities from zone A are higher than those from zone B.(2)
The strength of network effects between groups will affect the revenue of the North area. The greater the network effect is, the greater the revenue of the North area will be.(3)
When the FF&Cs take the North area as the operating location, the difference of the quality utility and the difference of the price utility impact the revenue of the North area. The greater the difference in the quality utility or price utility is, the greater the income of the North area will be.But there are still some shortcomings of this model. First, this model is a theory model; it is hard to use in practice. The characters should be collected and evaluated. Second some assumptions are too strict; for example, the DF&Cs from C and D zones may not choose Dalian or Tianjin as their operation location. Also DF&Cs in zone B may also choose other cross-border e-commerce comprehensive pilot areas as their operation location.Even though the model still casts same managerial implications to us,(1)
in order to maximize their revenue, Dalian and Tianjin should charge different price for the DF&Cs from different zones;(2)
in order to increase the revenue from zone A, the cities can increase the network effectsa, the difference of quality utility V2md, and the price utility V2kd.Future research: in this article South area is set exogenous, in the future research we can make it endogenous in the model. Another possible direction is to verify the model proposed in this article through simulation.



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*Source: 6216052-2016-10-25.xml*