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Market Making with Costly Monitoring: An Analysis of the SOES Controversy

Author

Listed:
  • Thierry Foucault

    (GREGH - Groupement de Recherche et d'Etudes en Gestion à HEC - HEC Paris - Ecole des Hautes Etudes Commerciales - CNRS - Centre National de la Recherche Scientifique)

  • Ailsa Röell

    (Department of economics - Princeton University)

  • Patrik Sandas

Abstract

We develop a model of price formation in a dealership market where monitoring of the information flow requires costly effort. The result is imperfect monitoring, which creates profit opportunities for speculators who pick off "stale quotes". Externalities associated with monitoring give rise to multiple equilibria in which dealers earn strictly positive expected profits. We obtain various policy implications. A switch to automatic execution can improve or worsen spreads and price discovery depending on the specific equilibrium. A reduction in the minimum quoted depth tightens the spread but it reduces price efficiency. Our analysis is relevant for the SOES controversy given that speculators in our model behave as the real world SOES "bandits". Our model predicts that SOES bandits should trade in stocks with small spreads and that SOES bandit activity should widen the spread. We provide empirical evidence consistent with these predictions.

Suggested Citation

  • Thierry Foucault & Ailsa Röell & Patrik Sandas, 2000. "Market Making with Costly Monitoring: An Analysis of the SOES Controversy," Working Papers hal-00601494, HAL.
    • Handle: RePEc:hal:wpaper:hal-00601494
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    JEL classification:

    • C53 - Mathematical and Quantitative Methods - - Econometric Modeling - - - Forecasting and Prediction Models; Simulation Methods
    • E30 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles - - - General (includes Measurement and Data)

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