The phrase refers to a tradition once common in U.S. saloons, which began offering “free” food to any customer who pur-chased at least one drink. Ranging from a sandwich to a multi-course meal, these free lunches were typically worth far more than the price of a single drink. However, the saloon-keepers were betting that most customers would buy more than one drink, and that the allure of free food would attract patrons during a less busy time of day.文內並引用《紐約時報》1872年報導，看了才知道「天下沒有白吃的午餐」原來是這麼來的。
延伸閱讀：雷恩斯法（Raines Law）
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