Abstract
Whether smiling could accrue monetary returns was tested. Two degrees of smiling to single men and women (N = 96) by a waitress in a cocktail lounge was evaluated in terms of number of drinks ordered, size of tip, and whether the customers smiled upon departure. A broad smile reaped more money than a minimal smile and more from men than from women patrons. The results are discussed in terms of reciprocal altruism.
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Tidd, K.L., Lockard, J.S. Monetary significance of the affiliative smile: A case for reciprocal altruism. Bull. Psychon. Soc. 11, 344–346 (1978). https://doi.org/10.3758/BF03336849
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DOI: https://doi.org/10.3758/BF03336849