The Wealth of Nations by Part 5 Chapter 2 Page 212

the quantity of money which can be had for them. The reduction in the money price of labour would necessarily be attended with a proportionable one in that of all home manufactures, which would thereby gain some advantage in all foreign markets. The price of some manufactures would be reduced in a still greater proportion by the free importation of the raw materials.

If raw silk could be imported from China and Indostan duty free, the silk manufacturers in England could greatly undersell those of both France and Italy. There would be no occasion to prohibit the importation of foreign silks and velvets. The cheapness of their goods would secure to our own workmen not only the possession of the home, but a very great command of the foreign market. Even the trade in the commodities taxed would be carried on with much more