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Learning with noiseless information and payoff-relevant signals

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  • Edward E. Schlee

    ()
    (Department of Economics, Arizona State University, Tempe, AZ 85287-3806, USA)

  • Manjira Datta

    ()
    (Department of Economics, Arizona State University, Tempe, AZ 85287-3806, USA)

  • Leonard J. Mirman

    ()
    (Department of Economics, University of Virginia, Charlottesville, VA 22901, USA)

Abstract

In models of active learning or experimentation, agents modify their actions to affect the distribution of a signal that provides information about future payoffs. A standard result in the experimentation literature is that agents experiment, if at all, to increase information. This finding is a direct consequence of Blackwell's theorem: one experiment is more informative than another if and only if all expected utility maximizers prefer to observe the first. Blackwell's theorem presupposes, however, that the observed signal only conveys information and does not directly affect future payoffs. Often, however, signals are directly payoff relevant, a phenomenon that we call signal dependence. For example, if a firm is uncertain about its demand and uses today's sales as a signal of tomorrow's demand, then that signal may also directly affect tomorrow's profit if the good is durable or if consumers form consumption habits. Datta, Mirman and Schlee [9] and Bertocchi and Spagat [4] show that, if the signal is payoff relevant, experimentation may indeed reduce information. Here we show that, despite the inapplicability of Blackwell's Theorem, agents always experiment to increase information if the information structure is noiseless: given the true value of the unknown parameter, the signal realization is deterministic. We then apply our framework to analyze Lazear's [16] model of retail clearance sales, a model with both signal dependence and noiseless information.

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Bibliographic Info

Article provided by Springer in its journal Economic Theory.

Volume (Year): 16 (2000)
Issue (Month): 1 ()
Pages: 63-75

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Handle: RePEc:spr:joecth:v:16:y:2000:i:1:p:63-75

Note: Received: February 19, 1999; revised version: August 11, 1999
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Related research

Keywords: Learning; Experimentation; Payoff-relevant signals; Noiseless information; Blackwell's theorem.;

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Cited by:
  1. Godfrey Keller, 2005. "The (in)appropriate benchmark when beliefs are not the only state variable," Economics Series Working Papers 223, University of Oxford, Department of Economics.
  2. Godfrey Keller, 2007. "Passive learning: a critique by example," Economic Theory, Springer, vol. 33(2), pages 263-269, November.

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