The Wealth of Nations by Part 1 Chapter 11 Page 288

provisions than it would have done during some part of the last century; and to ascertain whether this change be owing to a rise in the value of those goods, or to a fall in the value of silver, is only to establish a vain and useless distinction, which can be of no sort of service to the man who has only a certain quantity of silver to go to market with, or a certain fixed revenue in money.

I certainly do not pretend that the knowledge of this distinction will enable him to buy cheaper. It may not, however, upon that account be altogether useless.

It may be of some use to the public by affording an easy proof of the prosperous condition of the country. If the rise in the price of some sorts of provisions be owing altogether to a fall in the value of silver, it is owing to a circumstance