But though labour be the real measure of the exchangeable value of all commodities, it is not that by which their value is commonly estimated. It is often difficult to ascertain the proportion between two different quantities of labour. The time spent in two different sorts of work will not always alone determine this proportion. The different degrees of hardship endured, and of ingenuity exercised, must likewise be taken into account. There may be more labour in an hour’s hard work, than in two hours easy business; or in an hour’s application to a trade which it cost ten years labour to learn, than in a month’s industry, at an ordinary and obvious employment. But it is not easy to find any accurate measure either of hardship or ingenuity. In exchanging, indeed, the different productions of different sorts of labour for one another, some allowance is commonly made for both. It is adjusted, however, not by any accurate measure, but by the higgling and bargaining of the market, according to that sort of rough equality which, though not exact, is sufficient for carrying on the business of common life. Every commodity, besides, is more frequently exchanged for, and thereby compared with, other commodities, than with labour. It is more natural, therefore, to estimate its exchangeable value by the quantity of some other commodity, than by that of the labour which it can produce. The greater part of people, too, understand better what is meant by a quantity of a particular commodity, than by a quantity of labour. The one is a plain palpable object; the other an abstract notion, which though it can be made sufficiently intelligible, is not altogether so natural and obvious.