棉花作物总重量除以这个数字,得出生产同样重量羊毛需要多少只羊。GovernmentofSouthAustralia,“Grazinglivestock—asustainableandproductiveapproach,”Adelaide&MtLoftyRangesNaturalResourceManagementBoard,accessedMarch10,2013,
5EdwardBaines,HistoryoftheCottonManufactureinGreatBritain(London:H.Fisher,R.Fisher,andP.Jackson,1835),5–6;seeKennethPomeranz,TheGreatDivergence:China,Europe,andtheMakingoftheModernWorldEconomy(Princeton,NJ:PrincetonUniversityPress,2000).
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