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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 only be obtained through a costly search process. We consider an initial equilibrium where 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 post-entry 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. We show that strict Pareto improvements occur even in cases where the market maker's entry drives all middlemen out of business, monopolizing the intermediation of trade in the market.

Suggested Citation

  • John Rust & George Hall, 2002. "Middlemen versus Market Makers: A Theory of Competitive Exchange," NBER Working Papers 8883, National Bureau of Economic Research, Inc.
  • Handle: RePEc:nbr:nberwo:8883
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    References listed on IDEAS

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    5. George Hall and John Rust, Yale University, 2001. "Econometric Methods for Endogenously Sampled Time Series: The Case of Commodity Price Speculation in the Steel Market," Computing in Economics and Finance 2001 274, Society for Computational Economics.
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    JEL classification:

    • D4 - Microeconomics - - Market Structure, Pricing, and Design
    • D5 - Microeconomics - - General Equilibrium and Disequilibrium

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