圣路易斯华盛顿大学的心理学家莱昂纳德和乔尔·迈尔森发现，给小费者人是否慷慨可能会受到帐单金额的影响。

Leonard Green and Joel Myerson, psychologists at Washington University in St. Louis, found the generosity of a tipper may be limited by their bill.

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首先，消费者给多少小费与服务生拿到多少小费之间，根本不是简单的关系。

First, the connection between what the customer tips and what the waiter gets is far from straightforward.

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任何一个旅游者都知道，美国是世界上最爱给小费的国家。

Any traveller knows that the US is the world's most tip-happy country.

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