The Wealth of Nations by Part 4 Chapter 7 Page 167

from which the returns are frequent and near. Its effect has consequently been to turn a part of the capital of Great Britain from an employment in which it would have maintained a greater quantity of manufacturing industry to one in which it maintains a much smaller, and thereby to diminish, instead of increasing, the whole quantity of manufacturing industry maintained in Great Britain.

The monopoly of the colony trade, therefore, like all the other mean and malignant expedients of the mercantile system, depresses the industry of all other countries, but chiefly that of the colonies, without in the least increasing, but on the contrary diminishing that of the country in whose favour it is established.

The monopoly hinders the capital of that country, whatever may at any particular time