The quantity of labour put in motion and the value added to the annual produce by capitals vary with their employment.
There are four different ways of employing capital,
all of which are necessary,
(1) procuring rude produce,
(2) manufacturing,
(3) transportation,
and (4) distribution.
The employers of such capitals are productive labourers
the capital of the retailer employs only himself;
the capital of the merchant employs sailors and carriers;
the capital of the manufacturer employs his workmen;
the capital of the farmer employs his servants and his cattle, and adds a much greater value to the annual produce than other capital.
Capitals employed in agriculture and retail trade must reside within the country,
the capital of the merchant may reside anywhere;
the capital of the manufacturer must be where the manufacture is, but that is not necessarily determined.
Whether the merchant who exports belongs to the country or not makes little difference.
The capital of the manufacturer will put into motion more native labour if it resides within the country, but may be useful even if outside it.
Particular countries often have not enough capital for cultivation, manufactures, and transportation
In such cases the larger the proportion employed in agriculture, the larger will be the annual produce.
The quickest way to make the capital sufficient for all these purposes is to begin with the most profitable.
That they have done so is the principal cause of the progress of the American colonies.
Great countries have scarcely ever acquired sufficient capital for all those purposes.
Different kinds of wholesale trade employ different quantities of productive labour and add different amounts to the annual produce.
There are three different kinds of trade home, foreign and carrying.
Capital employed in buying in one part of the country to sell in another replaces two domestic capitals.
Capital employed in importation replaces one domestic and one foreign capital.
Its returns are not so quick as those of home trade.
Roundabout foreign trade has the same effect as direct.
Foreign trade carried on by means of gold and silver is in no way different from the rest.
Capital employed in the carrying trade replaces two foreign capitals. It may employ ships and sailors belonging to the country, but this is not always the case, and equal capital employed in importation or coasting trade may employ as many ships and men.
Capital in home trade therefore supports more productive labour than capital employed in foreign trade, which, however, supports more than capital in the carrying trade Political economy ought consequently not to allure capital into the foreign or the carrying trade,
though each is advantageous when naturally introduced.
The surplus of the produce of particular branches of industry must be sent abroad.
Foreign goods obtained in exchange must often be reexported.
When the other employments are full, the surplus capital disgorges itself into the carrying trade, which is a symptom rather than a cause of great national wealth.
The possible extent of the carrying trade is much the greatest.
Agriculture does not yield sufficient profit to attract all the capital which it might absorb. The reason will be explained in the next two books.