rockets and feathers understanding asymmetric pricing prices rise like rockets but fall like feathers this stylized fact of most markets is con rmed by many empirical studies in this paper i develop a model with competitive rms and rational partially informed consumers where such asymmetric response to costs by rms emerges naturally in contrast to public opinion and past work collusion is not necessary to explain such result using a rich dataset of retail gasoline prices i nd the observed price dispersion pattern to be consistent with the model s prediction

demand information and competition why do food prices fall at seasonal demand peaks prices for seasonal food products fall at demand peaks price declines are not driven by falling agricultural input prices indeed farm to retail margins narrow sharply i use electronic scanner data from a sample of us supermarkets to show that seasonal price declines are closely linked to market concentration and are much larger in markets with several rivals than where a single brand dominates seasonal demand increases reduce the effective costs of informative advertising and increased informative advertising by retailers and manufacturers in turn may allow for increased market information and greater price sensitivity on the part of buyers

discrete equilibrium price dispersion an explicit solution of an equilibrium model with price setting firms and searching customers makes possible a number of comparativestatics predictions about how cost differences among firms search costs of customers and taxes will affect the mean and variance of the distribution of market prices another implication of the model is that a firm s demand depends on the difference between its price and the average price in the market

does competition reduce price dispersion new evidence from the airline industry we analyze the effects of competition on price dispersion in the airline industry using panel data from 1993 q1 through 2006 q3 competition has a negative effect on price dispersion in line with the textbook treatment of price discrimination this effect is pronounced for routes with consumers characterized by relatively heterogeneous elasticities of demand on routes with a homogeneous customer base the effects of competition on price dispersion are smaller our results contrast with those of borenstein and rose who found that price dispersion increases with competition we reconcile the different results by showing that the cross sectional estimator suffers from omitted variable bias

modelling price dispersion as an outcome of competition in the irish grocery market the paper empirically models price dispersion between related brands within product categories of the irish independent grocery market retail brand prices are averaged over the independent shops stocking the brand since individual brands are retailed through different groups of shops brands are priced over heterogeneous consumer segments brand price dispersion is estimated to increase with competition when conditioned on brand distribution structures while controlling for other observed and unobserved deterministic factors the data suggest that brand pricing across consumer groups induce varying degrees of localised price competition rather than pricing across segments to extract consumer willingness to pay

learning in an equilibrium search model this paper explores the role of learning in an equilibrium search model with asymmetric information firms with identical but privately observed marginal cost sell a homogeneous good to heterogeneously informed consumers a reservation price equilibrium exists if the uninformed consumers search cost is sufficiently large in this equilibrium the amount of price dispersion is inversely related to the realization of marginal cost also the average price level is less responsive to cost changes than when cost is observable finally uncertainty about firms marginal cost increases the expected price level copyright 1994 by economics department of the university of pennsylvania and the osaka university institute of social and economic research association

consumer search and dynamic price dispersion an application to gasoline markets this article studies the role of imperfect information in explaining price dispersion we use a new panel data set on the u s retail gasoline industry and propose a new test of temporal price dispersion to establish the importance of consumer search we show that price rankings vary significantly over time however they are more stable among stations at the same street intersection weestablishtheequilibriumrelationshipsbetweenpricedispersionandkeyvariables from consumer search models price dispersion increases with the number of firms in the market decreases with the production cost and increases with search costs

search at wholesale auto auctions wholesale trade in used cars is conducted by ascending bid auctions with sale subject to the seller s acceptance of the winning bid one out of three times the seller rejects the bid and no trade takes place i model the seller s decision as the outcome of search and thus determined by the winning bid distribution and a reported retail price this market is ideal for testing search theory since all offers whether or not accepted are observed qualitative predictions of the theory in particular the role of the variance are confirmed the quantitative results are more ambiguous

price dispersion and inflation evidence from israel the paper considers the question whether observed price differentials reflect perceived differences in quality service agreements or location or whether information imperfections can explain this phenomenon it sets out theoretical arguments linking inflation to reductions in the information stock held by agents and thus to greater price dispersion the hypothesis is tested using monthly price data for 13 uniquely defined goods sold in israel between 1971 and 1984 price dispersion is shown to be positively related to the rate of market price inflation since inflation is an unlikely proxy for changes in perceived characteristics the findings support price dispersion theories based on optimally imperfect decision making

on fruitful and futile tests of the relationship between search and price dispersion we exploit cross sectional and temporal differences in search intensity in order to examine the relationship between search costs and price dispersion using a hand collected panel data set from jerusalem s shuk mahane yehuda outdoor market we present empirical evidence that price dispersion increases with the cost of search using several different measures of price dispersion however our interpretation of this finding is sensitive to the search proxy in question we also address several acute difficulties facing empiricists seeking to test theoretical price dispersion models in which consumers are heterogeneous in their search behavior jel l11 l13

price dispersion in an automobile insurance market from automobile insurance data for alberta over the period 1974 81 we find thatpremiums are highly correlated across driver classes in a given year but that premiums for a given driver class are not correlated over a period of more than 5 years firms relative market shares among drivers over age 25 and married males under 25 are inversely related to their deviations from the mean premiums in these driver classes the variance of real premiums decreases with the numberof firms in the market and increases with the real loss cost per car insured and the number of cars insured from these results we conclude that the price dispersion in automobile insurance in alberta is based on costly consumer search

number of sellers average prices and price dispersion abstract a variety of models provide differing predictions regarding the effect of an increase in the number of competitors in a market seller density on prices and price dispersion we review different approaches to generating equilibrium price dispersion and then empirically estimate the relationship between seller density average product price and price dispersion in the retail gasoline industry using four unique gasoline price data sets controlling for station level characteristics we find that an increase in station density consistently decreases both price levels and price dispersion across four geographical areas

oligopolistic pricing with sequential consumer search n identical stores compete by choosing prices for a homogeneous good with constant marginal costs consumers search sequentially with perfect recall for the lowest price one class of consumers called shoppers have zero search costs while all other consumers have a positive search cost c there is a unique symmetric nash equilibrium price distribution with the property that it changes smoothly from marginal cost pricing when all consumers are shoppers and or c 0 and monopoly pricing when no consumers are shoppers remarkably as the number of stores increases the nash equilibrium becomes more monopolistic copyright 1989 by american economic association

gasoline price dispersion and consumer search evidence from a natural experiment the vast majority of empirical studies examining the link between consumer search and price dispersion focus on how changes in consumer search impact price dispersion this article does the reverse it examines how a shock to price dispersion impacts consumer search a direct measure of search is used and an exogenous shock to price dispersion is found in a refinery fire that caused decades old retail gasoline price cycles and the nonlinear high frequency price dispersion pattern generated by them to stop identifying effects from this shock the results show a substantial response of consumer search to changes in price dispersion

the philippines roll on roll off policy and its impact on household income abstractour paper captures the immediate impact of the roll on roll off policy that offered an alternative system of inter island transfer within the philippines it provides evidence on the effect

price dispersion in the grocery market this paper provides an exploratory study of price dispersion in the grocery market and checks for the consistency of the evidence on this price dispersion with the existing theories of price dispersion due to costly consumer search competition and consumer heterogeneity in the context of the grocery market three dimensions of price dispersion are studied price dispersion for a certain brand across stores price dispersion within a category in a store across brands and price dispersion over time for a certain brand the results show that the standardized price dispersion is positively correlated with consumer search costs competition and consumer heterogeneity

price dispersion and competition with differentiated sellers i measure price dispersion among differentiated retail gasoline sellers and study the relationship between dispersion and the local competitive environment significant price dispersion exists even after controlling for differences in station characteristics and price differences between sellers change frequently the extent of price dispersion is related to the density of local competition but this relationship varies significantly depending on the type of seller and the composition of its competitors these findings are consistent with interactions between seller and consumer heterogeneity that are not well understood in the existing price dispersion literature

equilibrium price dispersion in retail markets for prescription drugs this study seeks to establish the empirical importance of price dispersion due to costly consumer search by examining retail prices for prescription drugs posted prices in two geographically distinct markets are shown to vary considerably across pharmacies within the same market even after one controls for variation due to pharmacy differences pharmacy heterogeneity accounts for at most one third of the observed price dispersion the empirical analysis hinges on the observation that consumers incentives to price shop depend on characteristics of the drug therapy cross sectional patterns in price distributions across drugs are consistent with the predictions of a search model prices for repeatedly purchased prescriptions for which the expected benefits of search are highest exhibit significant reductions in both dispersion and price cost margins

an empirical model of search with vertically differentiated products this paper presents a nonsequential search model that allows for vertical product dierentiation in the unique symmetric equilibrium firms with dierent characteristics draw utilities from a common utility distribution because the firms dier in their characteristics this leads to dierent price distributions the model therefore provides a theoretical rationale for explaining price dispersion as a result of quality dierences and search behavior of consumers together using the equilibrium conditions derived from the model it is shown how to estimate search costs by maximum likelihood using only price data a data set on prices from dutch supermarkets reveals that the amount of search has decreased over the sampling period moreover ignoring vertical product dierentiation results in an overestimation of search costs

strategic pricing consumer search and the number of firms discover prices there are three distinct price dispersed equilibria characterized by low moderate and high search intensity the effects of an increase in the number of firms on search behaviour expected prices price dispersion and welfare are sensitive i to the equilibrium consumers search intensity and ii to the status quo number of firms for instance when consumers search with low intensity an increase in the number of firms reduces search does not affect expected price leads to greater price dispersion and reduces welfare in contrast when consumers search with high intensity increased competition results in more search and lower prices when the number of competitors in the market is low to begin with but in less search and higher prices when the number of competitors is large duopoly yields identical expected price and price dispersion but higher welfare than an infinite number of firms a question that has received much attention in economic theory is how the number of competitors and market outcomes are related despite the existence of work showing the contrary see e g satterthwaite 1979 rosenthal 1980 the prediction that emerges from a market where firms interact in a cournot fashion has come to dominate economic thought namely that an increase in the number of competitors leads to larger aggregate production lower market price and improved market performance measured in terms of some social welfare criterion ruffin 1971 this paper challenges the generality of this belief by presenting an oligopoly model with consumer search where the equilibrium expected price may be constant increasing or nonmonotonic in the number of firms we present an economy with two types of consumers consumers who search for prices at no cost fully informed and consumers who must pay a fixed search cost for each price quotation they observe less informed 1 all buyers have the same willingness to pay for the good and buy either a single unit or nothing at all on the supply side of the market there are n firms producing a homogeneous good at constant marginal cost we analyse a one shot simultaneous move game firms set prices and consumers decide how many prices to search for at the same moment in time our model is essentially an oligopolistic version of burdett and judd 1983 where some consumers search costlessly in this model consumers search using a fixed sample size search strategy i e they choose the number of prices to observe before receiving any offer nonsequential search is appealing when consumers find it more advantageous to gather price information quickly morgan and manning 1985 this occurs when the search outcome is observed with delay and delay is costly for instance an mba graduate looking for a job 1 the presence in the model of consumers who search costlessly captures the fact that some people have a

small scale partial equilibrium model of natural gas markets responses to alternative deregulation scenarios and oil price changes a small scale model of natural gas markets explains regulated gas prices using past changes in residual fuel oil prices the study examines three different accelerated complete wellhead gas decontrol scenarios to find the impact of current law immediate decontrol and accelerated decontrol it finds that accelerated decontrol simply shifts price increases forward with minor impact while the revenue transfers are fairly substantial a windfall profits tax could capture much of this transfer but the revenues from such a tax would decrease sharply by the end of the period 23 references 4 figures 8 tables

truly costly sequential search and oligopolistic pricing we modify the paper of stahl 1989 stahl d o 1989 oligopolistic pricing with sequential consumer search american economic review 79 700 12 by relaxing the assumption that consumers obtain the first price quotation for free when all price quotations are costly to obtain the unique symmetric equilibrium need not involve full consumer participation the region of parameters for which non shoppers do not fully participate in the market becomes larger as the number of shoppers decreases and or the number of firms increases the comparative statics properties of this new type of equilibrium are interesting in particular expected price increases as search cost decreases and is constant in the number of shoppers and in the number of firms welfare falls as firms enter the market we show that monopoly pricing never obtains with truly costly search d 2005 elsevier b v all rights reserved

the impact of shopbot use on prices and price dispersion evidence from online book retailing abstract internet price search tools notably shopbots have reduced consumers search costs for price and product characteristics while a variety of analytic models predict that increased consumer search will lower price levels among competing retailers there is no consensus in the literature as to how price dispersion will change with increased consumer search moreover there are no papers that have empirically tested these predictions using direct observation of variation in shopbot use over time this paper examines the impact of changes in shopbot use over time on pricing behavior in the internet book market we do this by combining price and clickstream data collected from august 1999 to july 2001 a period of rapid expansion in shopbot use we find that a 1 increase in shopbot use is correlated with a 0 41 decrease in price levels and a 1 1 decrease in price dispersion

price response asymmetric information and competition we compare predictions from a theoretical model based on the structure of the main outdoor retail market in jerusalem with the results of an empirical analysis of price response to changes in cost we find that firms without adjacent competition exhibit both upward and downward price rigidity an outcome we ascribe to asymmetric information between the consumer and the firm given that previous studies have focused on downward price rigidities of firms with market power our findings highlight the importance of accounting for transitory information asymmetries between the consumer and the firm when studying price rigidity