The Economics Glossary defines money as follows:
Money is a good that acts as a medium of exchange in transactions. Classically it is said that money acts as a unit of account, a store of value, and a medium of exchange. Most authors find that the first two are nonessential properties that follow from the third. In fact, other goods are often better than money at being intertemporal stores of value, since most monies degrade in value over time through inflation or the overthrow of governments.
The Purpose of Money
So, money isn’t just pieces of paper. It’s a medium of exchange that facilitates trade. Suppose I have a Wayne Gretzky hockey card that I’d like to exchange for a new pair of shoes. Without the use of money, I have to find a person, or combination of people who have an extra pair of shoes to give up, and