therefore, as may give them that rank in the society which so important a trust requires.

The long time and the great expense which must be laid out in their education, when combined with this circumstance, necessarily enhance still further the price of their labour.

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 his 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.