Adam Smith however, speaks of the carrying trade as one not of choice, but of necessity; as if the capital engaged in it would be inert if not so employed, as if the capital in the home trade could overflow, if not confined to a limited amount. He says, "when the capital stock of any country is increased to such a degree, _that it cannot be all employed in supplying the consumption, and supporting the productive labour of that particular country_, the surplus part of it naturally disgorges itself into the carrying trade, and is employed in performing the same offices to other countries." "About ninety-six thousand hogsheads of tobacco are annually purchased with a part of the surplus produce of British industry. But the demand of Great Britain does not require, perhaps, more than fourteen thousand. If the remaining eighty-two thousand, therefore, could not be sent abroad _and exchanged for something more in demand at home_, the importation of them would cease immediately, _and with it the productive labour of all the inhabitants of Great Britain, who are at present employed in preparing the goods with which these eighty-two thousand hogsheads are annually purchased_." But could not this portion of the productive labour of Great Britain be employed in preparing some other sort of goods, with which something more in demand at home might be purchased? And if it could not, might we not employ this productive labour, though with less advantage, in making those goods in demand at home, or at least some substitute for them? If we wanted velvets, might we not attempt to make velvets; and if we could not succeed, might we not make more cloth, or some other object desirable to us? We manufacture commodities, and with them buy goods abroad, because we can obtain a greater quantity than we could make at home. Deprive us of this trade, and we immediately manufacture again for ourselves. But this opinion of Adam Smith is at variance with all his general doctrines on this subject. "If a foreign country can supply us with a commodity cheaper than we ourselves can make it, better buy it of them with some part of the produce of our own industry, employed in a way in which we have some advantage. _The general industry of the country being always in proportion to the capital which employs it_, will not thereby be diminished, but only left to find out the way in which it can be employed with the greatest advantage."