PJ Hancock & LM DeBruine (2003). What's a face worth: Noneconomic factors in game playing. Behavioral and Brain Sciences, 26(2): 162-163. doi: 10.1017/S0140525X03320059

Where behaviour defies economic analysis, one explanation is that individuals consider more than the immediate payoff. We present evidence that non-economic factors influence behaviour. Attractiveness influences offers in the Ultimatum and Dictator Games. Facial resemblance, a cue of relatedness, increases trusting in a two-node trust game. Only by considering the range of possible influences will game playing behaviour be explained.

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