When the trades which generally afford constant employment, happen in a particular place not to do so, the wages of the workmen always rise a good deal above their ordinary proportion to those of common labour. In London, almost all journeymen artificers are liable to be called upon and dismissed by their masters from day to day, and from week to week, in the same manner as day-labourers in other places. The lowest order of artificers, journeymen tailors, accordingly, earn their half-a-crown a-day, though eighteen pence may be reckoned the wages of common labour. In small towns and country villages, the wages of journeymen tailors frequently scarce equal those of common labour; but in London they are often many weeks without employment, particularly during the summer. When the inconstancy of employment is combined with the hardship, disagreeableness, and dirtiness of the work, it sometimes raises the wages of the most common labour above those of the most skilful artificers. A collier working by the piece is supposed, at Newcastle, to earn commonly about double, and, in many parts of Scotland, about three times, the wages of common labour. His high wages arise altogether from the hardship, disagreeableness, and dirtiness of his work. His employment may, upon most occasions, be as constant as he pleases. The coal-heavers in London exercise a trade which, in hardship, dirtiness, and disagreeableness, almost equals that of colliers; and, from the unavoidable irregularity in the arrivals of coal-ships, the employment of the greater part of them is necessarily very inconstant. If colliers, therefore, commonly earn double and triple the wages of common labour, it ought not to seem unreasonable that coal-heavers should sometimes earn four and five times those wages. In the inquiry made into their condition a few years ago, it was found that, at the rate at which they were paid, they could earn from six to ten shillings a-day. Six shillings are about four times the wages of common labour in London; and, in every particular trade, the lowest common earnings may always be considered as those of the far greater number. How extravagant soever those earnings may appear, if they were more than sufficient to compensate all the disagreeable circumstances of the business, there would soon be so great a number of competitors, as, in a 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.