But it is the extent of the market especially which determines the limits of the division of labor; for there is a direct and necessary relation between the division of labor and the exchange of its surplus. Hence, the division of labor may be carried farthest in the case of those products which are most easily transported from place to place, and which, at the same time, possess the utility that is most widely recognized. The smallness of the market may depend upon the scantiness of the population, or upon its scattered condition;(364) upon their smaller ability to pay, or upon the bad means of communication at their disposal.(365) Hence it is, that in villages, small cities, and still more on isolated farms, many branches of business are carried on by one person, which are divided among many in larger cities; and this is especially true in the case of businesses which have a chiefly local demand.(366) While, in small places, the barber is also frequently the physician, in larger ones there are dentists, oculists, accoucheurs, surgeons etc.(367); and while, in the former, the tavern keeper is both dry goods merchant and grocer, there are, in the latter, tea merchants, cigar-dealers, dealers in mourning goods (in London childbed-linen warehouses) etc., and hotels for all the different classes of travelers. There can be a distinct class of porters, hack-men etc., only where commerce is very active.(368) And even in cities like Paris, where the costly industries that minister to luxury, that of the jeweler, for instance, admit of only a limited division of labor, this effect depends on the smallness of the market; a market, indeed, which geographically may extend over the whole earth, but which, in an economic sense, must always remain small, on account of the small number of customers who have the ability to pay for their products. The real wonders produced by the division of labor and the employment of machinery we must look for in the manufacture of the cheapest and commonest commodities.(369) Section LXI. The Division Of Labor—Means Of Increasing It.