A recent study predicted and found that tip percentage declined as the size of the dining party increased. The prediction was based on the notion of diffusion of responsibility. An alternative explanation is offered that is rooted in the concept of equity.
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References
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Freeman, S., Walker, M.R., Borden, R., & Latane, B.Diffusion of responsibility and restaurant tipping. Personality and Social Psychology Bulletin, 1975, 1, 584-587.
