Purchasing Power - (adjective + noun)
(1) The purchasing power of a currency is the amount of goods and services that one unit of that currency can buy (purchase). (2) Purchasing power is also sometimes used to refer to how much money someone has to make to buy things (make purchases).
Source: Adapted from Investopedia and Business Dictionary
Example of Use: (1) The purchasing power of the dollar has collapsed over the last century. (2) As their salaries have been frozen for the last five years, the employees’ purchasing power has fallen.