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Middlemen versus Market Makers: A Theory of Competitive Exchange

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  • John Rust
  • George Hall

Abstract

We present a model in which the microstructure of trade in a commodity or asset is endogenously determined. Producers and consumers of a commodity (or buyers and sellers of an asset) who wish to trade can choose between two competing types of intermediaries: "middlemen" (dealer/brokers) and "market makers" (specialists). Market makers post publicly observable bid and ask prices, whereas the prices quoted by different middlemen are private information that can be obtained only through a costly search process. We consider an initial equilibrium with which there are no market makers but there is free entry of middlemen with heterogeneous transactions costs. We characterize conditions under which entry of a single market maker can be profitable even though it is common knowledge that all surviving middlemen will undercut the market maker's publicly posted bid and ask prices in the postentry equilibrium. The market maker's entry induces the surviving middlemen to reduce their bid-ask spreads, and as a result, all producers and consumers who choose to participate in the market enjoy a strict increase in their expected gains from trade. When there is free entry into market making and search and transactions costs tend to zero, bid-ask spreads of all market makers and middlemen are forced to zero, and a fully efficient Walrasian equilibrium outcome emerges.

Suggested Citation

  • John Rust & George Hall, 2003. "Middlemen versus Market Makers: A Theory of Competitive Exchange," Journal of Political Economy, University of Chicago Press, vol. 111(2), pages 353-403, April.
  • Handle: RePEc:ucp:jpolec:v:111:y:2003:i:2:p:353-403
    DOI: 10.1086/367684
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    References listed on IDEAS

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    More about this item

    JEL classification:

    • D4 - Microeconomics - - Market Structure, Pricing, and Design
    • D5 - Microeconomics - - General Equilibrium and Disequilibrium
    • D6 - Microeconomics - - Welfare Economics
    • G2 - Financial Economics - - Financial Institutions and Services
    • L1 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance

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