Tipping, psychologists (心理学家) have found, is not just about service. Instead, studies have shown that tipping can be affected by psychological reactions to a series of different factors (因素) from the waiter’s choice of words to how they carry themselves while taking orders to the bill’s total. Even how much waiters remind customers of themselves can determine how much change they pocket by the end of the night.

心理学家发现，收取小费不仅仅关系到服务本身。恰恰相反,研究还表明,收取小费行为可能受到对一系列情况各异因素的心理反应的影响。这些因素涉及服务员应对辞令是否娴熟，他们从客人点菜到客人结账整个过程的行为举止是否得体，甚至服务员在多大程度上是否赢得客人的好感也能决定到晚上营业结束时他们装入腰包的零钱数量。