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Building on Ruffin's recent interpretation of Ricardo's four numbers as labour embodied in trade rather than domestic labour coefficients, I identify the magic behind these four mystical numbers. I show that the magic lies in Ricardo's underlying logic in predicting the pattern of international trade. Using a single graphical framework, I show that Ricardo's logic provides a device for a unified treatment of the commodity and the factor content predictions of international trade with andoi:10.2139/ssrn.956598 fatcat:3p7mqh4m7ngebmbcszephjq5vm