contracts). But the longer period of service one could expect from a slave still would not justify slavery economically, the great economist Adam Smith argued. An inherent flaw with slavery, he maintained, is that slaves made unsatisfactory workers. Because they were usually from distant cultures, they often didn’t speak their owners’ language and could be so unfamiliar with their owners’ societies that they would have to be trained from scratch (Africans, for example, knew only tropical forms of agriculture). Worse, they had every incentive to escape, wreak sabotage, or kill their owners, the
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