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Win Stay, Lose Shift or Imitatation – Only the Choice of Peers Counts

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Abstract

Win Stay, Lose Shift as well as imitation strategies for iterated games rely on an aspiration level. With both learning rules a move is repeated unless the pay-off fell short of the aspiration level. I investigate social adaptation mechanisms for the aspiration level and their impact on the efficiency of learning in a large population of agents that repeatedly play one round of a symmetric 2x2 game against randomly chosen opponents. It turns out that if the aspiration level is given by the last payoff of the current opponent the population receives the maximal symmetric payoff of the game in the long run. If the aspiration level is determined by independently chosen agents the outcome is related to the evolutionarly stable strategies. This holds for win stay, lose shift as well as for imitation based learning. These results suggest that the choice of peers can be crucial for the efficiency of learning.

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  • Martin Posch, 2001. "Win Stay, Lose Shift or Imitatation – Only the Choice of Peers Counts," Vienna Economics Papers vie0109, University of Vienna, Department of Economics.
    • Handle: RePEc:vie:viennp:vie0109
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    More about this item

    JEL classification:

    • C72 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory - - - Noncooperative Games
    • D83 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Search; Learning; Information and Knowledge; Communication; Belief; Unawareness

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