Stability under learning of equilibria in financial markets with supply information
In a recent paper Ganguli/Yang (2009) demonstrate, that there can exist multiple equilibria in a financial market model a' la Grossman/Stiglitz (1980) if traders possess private information regarding the supply of the risky asset. The additional equilibria differ in some important respects from the usual equilibrium of the Grossman-Stiglitz type which still exists in this model. This note shows that these additional equilibria are always unstable under eductive learning (cf. Guesnerie (2002)) and adaptive learning via least-squares estimation (cf. Marcet/Sargent (1988) or Evans/Honkapohja (2001)). Regarding the original Grossman-Stiglitz type equilibrium, the stability results are less clear cut, since this equilibrium might be unstable under eductive learning while it is always stable under adaptive learning.
Volume (Year): 30 (2010)
Issue (Month): 1 ()
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"On the Impossibility of Informationally Efficient Markets,"
Levine's Working Paper Archive
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- Heinemann, Maik, 2009. "E-stability and stability of adaptive learning in models with private information," Journal of Economic Dynamics and Control, Elsevier, vol. 33(12), pages 2001-2014, December.
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