business, there would soon be so great a number of competitors, as, in a trade which has no exclusive privilege, would quickly reduce them to a lower rate. The constancy or inconstancy of employment cannot affect the ordinary profits of stock in any particular trade. Whether the stock is or is not constantly employed, depends, not upon the trade, but the trader. Fourthly, the wages of labour vary according to the small or great trust which must be reposed in the workmen. The wages of goldsmiths and jewellers are everywhere superior to those of many other workmen, not only of equal, but of much superior ingenuity, on account of the precious materials with which they are entrusted. We trust our health to the physician, our fortune, and sometimes our life and reputation, to the lawyer and attorney. Such confidence could not safely be reposed in people of a very mean or low condition. Their reward must be such, 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 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.