Leonard Green and Joel Myerson, psychologists at Washington University in St. Louis, found the generosity of a tipper may be limited by their bill.
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。
Their generosity is putting an additional burden on their limited resources.
而他们的慷慨也成为有限资源的额外负担。
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