The Wealth of Nations by Part 4 Chapter 3 Page 71

It would be, at least, three times more advantageous than the boasted trade with our North American colonies, in which the returns were seldom made in less than three years, frequently not in less than four or five years. France, besides, is supposed to contain twenty-four millions of inhabitants. Our North American colonies were never supposed to contain more than three millions; and France is a much richer country than North America; though, on account of the more unequal distribution of riches, there is much more poverty and beggary in the one country than in the other. France, therefore, could afford a market at least eight times more extensive, and, on account of the superior frequency of the returns, four-and-twenty times more advantageous than that which our North American colonies ever afforded.