The Wealth of Nations by Part 4 Chapter 8 Page 40

old monopoly. Graziers separated from one another, and dispersed through all the different corners of the country, cannot, without great difficulty, combine together for the purpose either of imposing monopolies upon their fellow citizens, or of exempting themselves from such as may have been imposed upon them by other people. Manufacturers of all kinds, collected together in numerous bodies in all great cities, easily can. Even the horns of cattle are prohibited to be exported; and the two insignificant trades of the horner and combmaker enjoy, in this respect, a monopoly against the graziers.

Restraints, either by prohibitions or by taxes, upon the exportation of goods which are partially, but not completely manufactured, are not peculiar to the manufacture of leather. As long as anything remains to be done, in order to