many sailors and shipping, either in the foreign trade of consumption, or even in the home-trade, when carried on by coasting vessels, as it could in the carrying trade. The number of sailors and shipping which any particular capital can employ, does not depend upon the nature of the trade, but partly upon the bulk of the goods in proportion to their value, and partly upon the distance of the ports between which they are to be carried; chiefly upon the former of those two circumstances. The coal-trade from Newcastle to London, for example, employs more shipping than all the carrying trade of England, though the ports are at no great distance. To force, therefore, by extraordinary encouragements, a larger share of the capital of any country into the carrying trade, than what would naturally go to it, will not always necessarily increase the shipping of that country.
The capital, therefore, employed in the home-trade of any country will generally give encouragement and support to a greater quantity of productive labour in that country, and increase the value of its annual produce more than an equal capital employed in the foreign trade of consumption: and the capital employed in this latter trade has in both these respects a still greater advantage over an equal capital employed in the carrying trade. The riches, and so far as power depends upon riches, the power of every country, must always be in proportion to the value of its annual produce, the fund from which all taxes must ultimately be paid. But the great object of the political œconomy of every country, is to increase the riches and power of that country. It ought, therefore, to give no preference nor superior encouragement to the foreign trade of consumption above the home-trade, nor to the carrying trade above either of the other two. It ought neither to force nor to allure into either of those two channels, a greater share of the capital of the country than what would naturally flow into them of its own accord.
Each of those different branches of trade, however, is not only advantageous, but necessary and unavoidable, when the course of things, without any constraint or violence, naturally introduces it.