Bulletin of the Psychonomic Society

, Volume 11, Issue 6, pp 344–346 | Cite as

Monetary significance of the affiliative smile: A case for reciprocal altruism

  • Kathi L. Tidd
  • Joan S. Lockard


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.


Personal Space Monetary Benefit Monetary Return Reciprocal Altruism Mouth Corner 
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Copyright information

© Phychonomic Society, Inc. 1978

Authors and Affiliations

  • Kathi L. Tidd
    • 1
  • Joan S. Lockard
    • 1
  1. 1.University of WashingtonSeattle

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