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Tipping has long been a part of service culture in the U.S., but in the last few years, the number of places where we're asked to tip has multiplied. Social psychologist and tipping researcher Michael Lynn, PhD, discusses “tip creep” and how digital payment screens are reshaping expectations; why social norms drive our tipping behavior; how tipping norms vary from country to country; how biases affect who gets tipped more; and whether tipping is a fair way to compensate people.

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