Money is best defined as whatever serves society in three functions: medium of exchange, store of value, and unit of account.
Barter is best defined as a situation where two individuals each want some or service that the other can provide.
A double coincidence of wants is a situation where two individuals each want some or service that the other can provide.
Money is anything that is accepted by the general public as a means of payment for products and for repayment of debt.
Barter is when people exchange goods with goods. For barter to occur, there has to be a double coincidence of wants. This means that someone has to have what you want and that person wants what you have.
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