Stores

Summary There is scope and incentive for stores to endogenously arise in an exchange economy when agents possess different levels of bargaining power and coalition formation is costly. In the absence of stores, agents face a trading lottery where the expected outcome for an individual agent depends upon his relative bargaining strength. By setting appropriate, preannounced prices, a store can profitably offer relatively weak bargainers trading opportunities which they prefer to the trading lottery. While relatively weak bargainers are attracted to the store, relatively strong bargainers prefer the trading lottery to the store. Thus, the simultaneous existence of barter and mediated trade is explained.The work reported here was conceived while both authors were visiting the University of Southern California. We thank Martine Quinzii and two anonymous referees for helpful comments.