The Wealth of Nations by Part 5 Chapter 2 Page 170

effect upon the wages of labour. The same thing may be said of the taxes upon tea and sugar, which in England and Holland have become luxuries of the lowest ranks of people, and of those upon chocolate, which in Spain is said to have become so. The different taxes which in Great Britain have in the course of the present century been imposed upon spirituous liquors are not supposed to have had any effect upon the wages of labour. The rise in the price of porter, occasioned by an additional tax of three shillings upon the barrel of strong beer, has not raised the wages of common labour in London.

These were about eighteen pence and twenty pence a day before the tax, and they are not more now.

The high price of such commodities does not necessarily diminish the ability of the inferior ranks