P-STABLE EQUILIBRIUM: DEFINITION AND SOME PROPERTIES

We deÖne a continuous index of strategic stability, pstability, which requires equilibrium to be the unique outcome compatible with common knowledge of rationality and common knowledge of pbeliefs (beliefs that put probability at least p on the equilibrium proÖle). We show that every equilibrium (within a large class) is p-stable for some p < 1 and justify, in smooth settings, the intuition that the slope of the best response map is related to the stability of equilibrium. We show that adding incomplete information on fundamentals could decrease the degree of strategic stability. In two applications to large markets we (i) show that a unique equilibrium globally unstable (under t‚tonnement dynamics) has, nevertheless, a measure of strategic stability, (ii) characterize the conditions under which enhanced equilibrium e¢ ciency results in decreased strategic stability.


Issue Date:
Dec 17 2010
Publication Type:
Working or Discussion Paper
Record Identifier:
http://ageconsearch.umn.edu/record/270772
Language:
English
Total Pages:
30
JEL Codes:
C70; D84
Series Statement:
WERP 952




 Record created 2018-04-05, last modified 2018-04-05

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