Bryan R. Routledge



Adaptive Learning in Financial Markets
Bryan R. Routledge, Carnegie Mellon University
Review of Financial Studies, Winter 1999 vol 12, 5, page 1165-1202.

ABSTRACT
We investigate adaptive or evolutionary learning in a repeated version of the Grossman and Stiglitz (1980) model. We demonstrate that any process that is a monotonic selection dynamic will converge to the rational expectations asset demands if the proportion of informed traders is fixed. We also show that these learning processes have a unique asymptotically stable fixed point at the Grossman-Stiglitz (GS) equilibrium. The robustness of learning to noisy experimentation is studied using Binmore and Samuelson's (1995) deterministic drift approximation. Conditions on economic and learning process parameters for adaptive learning to lead to the GS rational expectations equilibrium are presented.

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NOTES: Genetic Algorithm Learning to Choose and Use Information is a related paper that uses the same economy to investigate a genetic algorithm as a model of learning.
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