We paid attention to one of the cognitive biases, that is, the outcome bias. We explored the evidence of outcome bias in a two-player economic game experiment where reward allocation is made between two players. The outcome bias occurred even when the intention of Player 1 was fair or generous. Thus, we could verify the hypothesis that we are readily led into the outcome bias. The comparative results between the two conditions (intentional and no-intentional conditions) definitely showed that Player 2 punished Player 1 to a larger extent when the outcome was disadvantageous for Player 2 (selfish outcome) irrespective of whether the die was chosen out of three types intentionally or not.
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