GAINS FROM TRADE
研究在贸易自由化中是否存在无人受损的规则，提出扩大可贸易商品集不损害任何人的公理，并证明满足该公理时贸易收益只能分配给一个人。
In a social choice context, we ask whether there exists a rule in which nobody loses under trade liberalization. We consider a resource allocation problem in which the traded commodities vary. We propose an axiom stating that enlarging the set of tradable commodities hurts nobody. We show that if a rule satisfies this axiom, together with an allocative efficiency axiom and an institutional constraint axiom stating that only preferences over tradable commodities matter, gains from trade can be given to only one individual in the first step of liberalization.