Intrinsic things are priceless: the love of your life, or a beautiful sunset. There is no objective way to measure these, nor should there be.
The worth of monetary transactions is also difficult to measure. While there is a price, wage, or other kind of transaction that can be recorded at a precise price, the worth of the amount must be interpreted. The father of economics, Adam Smith, discussed this very question in one of the most important books in economics, The Wealth of Nations (1776):
"The real price of every thing, what every thing really costs to the man who wants to acquire it, is the toil and trouble of acquiring it... But though labour be the real measure of the exchangeable value of all commodities, it is not that by which their value is commonly estimated... Every commodity, besides, is more frequently exchanged for, and thereby compared with, other commodities than with labour." |