I am reading the 1939 edition of a book called An Inquiry Into the Nature and Causes of the Wealth of Nations by Adam Smith. In the editor's introduction the editor summarizes one of Smith's points. Here is the quote,The natural sciences really blossomed when standards were created for units of measure. We don't allow the meaning of a kilogram to change from day to day. Should we have the same strict requirement for our money?Lowering and raising the coins are unjust and pernicious operations. Copious mines abate the value of the precious metals.