The researchers calculated that a population which followed a Nash strategy would contract 100 times more infections than one which followed a utilitarian strategy.

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In this situation, the utilitarian strategy is also the Nash strategy.

ECONOMIST: Flu vaccination

Combining those findings with the other results of the survey, the researchers concluded that if their subjects were better informed, their incentives to act more selfishly would increase, and the pattern of immunisation would look even more like a Nash strategy.

ECONOMIST: Flu vaccination