呢個世上冇免費嘅午餐
冇免費午餐咁嘅嘢（英文：There Ain't No Such Thing As A Free Lunch，或者There's no such thing as a free lunch，縮寫：TANSTAAFL、TANSTAAFL、TINSTAAFL）係一個好流行嘅講法，係想表達冇嘢係可以白白得到嘅。
呢句嘢喺20世紀30年代已經用緊，但係第一次係幾時用就查唔到嘞。呢句嘢入便講嘅「免費午餐」（"free lunch"）係指19世紀喺美國酒吧啲嘢飲跟埋「免費午餐」嘅做法。呢句話同埋個縮寫係 Robert Heinlein 嘅 1966年 自由主義者科幻小說（"libertarian science fiction"）The Moon is a Harsh Mistress 嘅重心，令到呢個概念流行咗。1975年，以主張自由市場而出名嘅美國經濟學家佛利民用呢句嘢做咗一本書嘅名，令「免費午餐」呢個概念多咗人知，同埋佢亦經常出現响經濟學嘅教科書；Campbell McConnell 寫過話呢個概念係「响經濟嘅核心」。
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