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When a person employs only his own stock in trade, there is no

trust; and the credit which he may get from other people,

depends, not upon the nature of the trade, but upon their opinion

of his fortune, probity and prudence. The different rates of

profit, therefore, in the different branches of trade, cannot

arise from the different degrees of trust reposed in the traders.

Fifthly, the wages of labour in different employments vary

according to the probability or improbability of success in them.