The Wealth of Nations by Part 5 Chapter 2 Page 178

In a country where the winters are so cold as in Great Britain, fuel is, during that season, in the strictest sense of the word, a necessary of life, not only for the purpose of dressing victuals, but for the comfortable subsistence of many different sorts of workmen who work within doors; and coals are the cheapest of all fuel. The price of fuel has so important an influence upon that of labour that all over Great Britain manufactures have confined themselves principally to the coal countries, other parts of the country, on account of the high price of this necessary article, not being able to work so cheap.

In some manufactures, besides, coal is a necessary instrument of trade, as in those of glass, iron, and all other metals. If a bounty could in any case be reasonable, it might perhaps be so upon the transportation of