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Informational Efficiency under Short Sale Constraints

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  • Robert A. Jarrow
  • Martin Larsson

Abstract

A constrained informationally efficient market is defined to be one whose price process arises as the outcome of some equilibrium where agents face restrictions on trade. This paper investigates the case of short sale constraints, a setting which despite its simplicity, generates new insights. In particular, it is shown that short sale constrained informationally efficient markets always admit equivalent supermartingale measures and local martingale deflators, but not necessarily local martingale measures. And if in addition some local martingale deflator turns the price process into a true martingale, then the market is constrained informationally efficient. Examples are given to illustrate the subtle phenomena that can arise in the presence of short sale constraints, with particular attention to representative agent equilibria and the different notions of no arbitrage.

Suggested Citation

  • Robert A. Jarrow & Martin Larsson, 2014. "Informational Efficiency under Short Sale Constraints," Papers 1401.1851, arXiv.org.
    • Handle: RePEc:arx:papers:1401.1851
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    Cited by:

    1. Robert A. Jarrow, 2015. "Asset Price Bubbles," Annual Review of Financial Economics, Annual Reviews, vol. 7(1), pages 201-218, December.

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