Update: Some commenters point out that sometimes the world does offer Pareto improvements, such as the gains from trade in a Ricardian trade model, and that these are free lunches.
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更新:有评论指出,这个世界,有时确实存在怕累托改善,比如在李嘉图贸易模型中的贸易收益,这些就是免费的午餐。
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