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Welfare Consequences of Information Aggregation and Optimal Market Size

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  • Kei Kawakami

    (Department of Economics, University of Melbourne)

Abstract

This paper studies a risk-sharing model where traders face endowment shocks and information asymmetries. We show that a negative participation externality arises due to the endogenous information aggregation by prices, and it creates a counter force to a standard positive externality of risk-sharing. As a result, the optimal market size that maximizes gains from trade per trader is ?nite. The model indicates that a collection of small markets can be a constrained e¢ cient market structure. We also study a decentralized process of market formation, and show that multiple markets can survive because of the negative informational externality among traders.

Suggested Citation

  • Kei Kawakami, 2015. "Welfare Consequences of Information Aggregation and Optimal Market Size," Department of Economics - Working Papers Series 1189, The University of Melbourne.
    • Handle: RePEc:mlb:wpaper:1189
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    Cited by:

    1. Babus, Ana & Parlatore, Cecilia, 2022. "Strategic fragmented markets," Journal of Financial Economics, Elsevier, vol. 145(3), pages 876-908.
    2. Arnold, Lutz G. & Zelzner, Sebastian, 2022. "Financial trading versus entrepreneurship: Competition for talent and negative feedback effects," The Quarterly Review of Economics and Finance, Elsevier, vol. 86(C), pages 186-199.
    3. Lou, Youcheng & Rahi, Rohit, 2021. "Information, market power and welfare," LSE Research Online Documents on Economics 118843, London School of Economics and Political Science, LSE Library.
    4. Colin von Negenborn, 2023. "The more the merrier? On the optimality of market size restrictions," Review of Economic Design, Springer;Society for Economic Design, vol. 27(3), pages 603-634, September.
    5. Marzena Rostek & Ji Hee Yoon, 2021. "Exchange Design and Efficiency," Econometrica, Econometric Society, vol. 89(6), pages 2887-2928, November.

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    More about this item

    Keywords

    Asymmetric information; Imperfect competition; Information aggregation; Market fragmentation; Network externality puzzle.;
    All these keywords.

    JEL classification:

    • D43 - Microeconomics - - Market Structure, Pricing, and Design - - - Oligopoly and Other Forms of Market Imperfection
    • D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information; Mechanism Design
    • G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies; Insider Trading
    • L13 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Oligopoly and Other Imperfect Markets

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