The Wealth of Nations by Part 5 Chapter 2 Page 152

rise in the price of manufactured goods, than would have followed from the proper assessment of a sum equal to the produce of the tax partly upon the rent of land, and partly upon consumable commodities.

If direct taxes upon the wages of labour have not always occasioned a proportionable rise in those wages, it is because they have generally occasioned a considerable fall in the demand for labour. The declension of industry, the decrease of employment for the poor, the diminution of the annual produce of the land and labour of the country, have generally been the effects of such taxes. In consequence of them, however, the price of labour must always be higher than it otherwise would have been in the actual state of the demand: and this enhancement of price, together with the profit of those who advance it, must always be