Since inflation is a monetary question and nothing but a monetary question, it cannot be understood without first knowing what money is. To most people money is the notes and coins they use to buy things, a convenient technical device for ensuring the smooth exchange and distribution of goods. While it is indeed such a medium of exchange, the currency we use today is not, strictly speaking, money at all, but only tokens for it. But to explain money it is convenient to start with this role of medium of exchange.