elements: first, real wages, or wages in kind, or in other words, the quantity which the labourer obtains of the ordinary articles of consumption; and secondly, the money prices of those articles. In all old countries—all countries in which the increase of population is in any degree checked by the difficulty of obtaining subsistence—the habitual money price of labour is that which will just enable the labourers, one with another, to purchase the commodities without which they either cannot or will not keep up the population at its customary rate of increase. Their standard of comfort being given, (and by the standard of comfort in a labouring class, is meant that, rather than forego which, they will abstain from multiplication,) money wages depend on the money price, and therefore on the cost of production, of the various articles which the labourers habitually consume: because if their wages cannot procure them a given quantity of these, their increase will slacken, and their wages rise. Of these articles, food and other agricultural produce are so much the principal, as to leave little influence to anything else.
It is at this point that we are enabled to invoke the aid of the principles which have been laid down in this Third Part. The cost of production of food and agricultural produce has been analyzed in a preceding chapter. It depends on the productiveness of the least fertile land, or of the least productively employed portion of capital, which the necessities of society have as yet put in requisition for agricultural purposes. The cost of production of the food grown in these least advantageous circumstances, determines, as we have seen, the exchange value and money price of the whole. In any given state, therefore, of the labourers' habits, their money wages depend on the productiveness of the least fertile land, or least productive agricultural capital; on the point which cultivation has reached in its downward progress—in its encroachments on the barren lands, and its gradually increased strain upon the powers of the more fertile. Now,
