Money has changed form throughout the centuries, from seashells, to beads, to precious metals, to coins, to paper notes, and the bank accounts that store and distribute them, for a fee! Money, in its various forms, is a medium of exchange to pay for goods and services or to pay off debts. It is also a unit of account and a store of value. Aristotle elaborated on the characteristics of money by first proclaiming that it is a fundamental measurement of everything. The purpose of money is to provide a unit through which individuals may equitably exchange goods and services. Aristotle specifies that money should be durable, portable, divisible, fungible, and contain intrinsic value.