The Wealth of Nations by Part 4 Chapter 7 Page 122

capital which had before been employed in them. But this revulsion of capital, as it must have gradually increased the competition of capitals in the colony trade, so it must have gradually diminished that competition in all those other branches of trade; as it must have gradually lowered the profits of the one, so it must have gradually raised those of the other, till the profits of all came to a new level, different from and somewhat higher than that at which they had been before.

This double effect of drawing capital from all other trades, and of raising the rate of profit somewhat higher than it otherwise would have been in all trades, was not only produced by this monopoly upon its first establishment, but has continued to be produced by it ever since.

First, this monopoly has been