They amounted, therefore, to a prohibition, at first of claying or refining sugar for any foreign market, and at present of claying or refining it for the market, which takes off, perhaps, more than nine-tenths of the whole produce.
1776, Adam Smith, An Inquiry into the Nature and Causes of the Wealth of Nations, Book IV, Chapter 7: Of Colonies, Part 2: Causes of Prosperity of New Colonies