of foreign commodities, less can be employed in the purchase of other things, and therefore fewer hats, shoes, &c. will be required. At the same time that capital is liberated from the production of shoes, hats, &c. more must be employed in manufacturing those commodities with which foreign commodities are purchased; and consequently in all cases the demand for foreign and home commodities together, as far as regards value, is limited by the revenue and capital of the country. If one increases, the other must diminish. If the importation of wine, given in exchange for the same quantity of English commodities be doubled, the people of England can either consume double the quantity of wine that they did before, or the same quantity of wine and a greater quantity of English commodities. If my revenue had been 1000l., with which I purchased annually one pipe of wine for 100l. and a certain quantity of English commodities for 900l.; when wine fell to 50l. per pipe, I might lay out the 50l. saved, either in the purchase of an additional pipe of wine, or in the purchase of more English commodities. If I bought more wine, and every wine-drinker did the same, the foreign trade would not be in the least disturbed; the same quantity of English commodities would be exported in exchange for wine, and we should receive double the quantity, though not double the value of wine. But if I, and others contented ourselves with the same quantity of wine as before, fewer English commodities would be exported, and the wine-drinkers might either consume the commodities which were before exported, or any others for which they had an inclination. The capital required for their production would be supplied by the capital liberated from the foreign trade.
There are two ways in which capital may be accumulated: it may be saved either in consequence of increased revenue, or of diminished consumption. If my profits are raised from 1000 l. to 1200 l. while my expenditure continues the same, I accumulate annually 200 l. more than I did before. If I save 200 l. out of my expenditure while my profits continue the same, the same effect will be produced; 200 l. per annum