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Rational Information Choice in Financial Market Equilibrium

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  • Marc-Andreas Muendler

Abstract

Adding a stage of signal acquisition to the expected utility model shows that Bayesian updating results in a well defined law of demand for financial information when asset return distributions are conjugate priors to signals such as in the gamma-Poisson case. Signals have a positive marginal utility value that falls in their number if and only if investors are risk averse, asset markets large, and variance-mean ratios of asset returns high in fully revealing rational expectations equilibrium. Expected asset price increases in the number of signals so that expected excess return drops. The diminishing excess return prevents Bayesian investors from unbounded information demand even if signals are costless, unless the riskfree asset is removed. Signals mutually benefit homogeneous investors because revealing asset price permits updating so that a Pareto criterion judges competitive equilibrium as not sufficiently informative. However, asset price responses make incentives for signal acquisition dependent on portfolios so that welfare and distributional consequences become intricately linked when investors are heterogeneous.

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Paper provided by CESifo Group Munich in its series CESifo Working Paper Series with number 1436.

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Date of creation: 2005
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Handle: RePEc:ces:ceswps:_1436

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Cited by:
  1. Dirk Niepelt & Martin Gonzalez-Eiras, 2007. "Sustaining Social Security," 2007 Meeting Papers, Society for Economic Dynamics 95, Society for Economic Dynamics.
  2. Nocetti, Diego, 2006. "Markowitz meets Kahneman: Portfolio selection under divided attention," Finance Research Letters, Elsevier, Elsevier, vol. 3(2), pages 106-113, June.

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