Please use this identifier to cite or link to this item: http://hdl.handle.net/10419/72629
Authors: 
Adam, Klaus
Year of Publication: 
2003
Series/Report no.: 
CFS Working Paper 2003/03
Abstract: 
We study adaptive learning in a monetary overlapping generations model with sticky prices and monopolistic competition for the case where learning agents observe current endogenous variables. Observability of current variables is essential for informational consistency of the learning setup with the model set up but generates multiple temporary equilibria when prices are flexible and prevents a straightforward construction of the learning dynamics. Sticky prices overcome this problem by avoiding simultaneity between prices and price expectations. Adaptive learning then robustly selects the determinate (monetary) steady state independent from the degree of imperfect competition. The indeterminate (non-monetary) steady state and non-stationary equilibria are never stable. Stability in a deterministic version of the model may differ because perfect foresight equilibria can be the limit of restricted perceptions equilibria of the stochastic economy with vanishing noise and thereby inherit different stability properties. This discontinuity at the zero variance of shocks suggests to analyze learning in stochastic models.
Subjects: 
adaptive learning
sticky prices
temporary equilibrium
JEL: 
E31
D84
C62
Persistent Identifier of the first edition: 
Document Type: 
Working Paper

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