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Why Do Experimental Subjects Choose an Equilibrium which Is Neither Payoff Nor Risk Dominant?

In an experimental 2x2 coordination game with two strict equilibria we observe that, in contrast to equilibrium selection theory (Harsanyi and Selten 1988), only half of the subjects choose the strategy that relates to the payoff- and risk-dominant equilibrium. We propose modified risk dominance as an explanation for the observed deviations from payoff and risk dominance.
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