Commodity money is money whose value comes from a commodity of which it is made. Commodity money consists of objects having value or use in themselves (intrinsic value) as well as their value in buying goods.
This is in contrast to representative money, which has no intrinsic value but represents something of value such as gold or silver, in which it can be exchanged, and fiat money, which derives its value from having been established as money by government regulation.
Examples of commodities that have been used as media of exchange include gold, silver, copper, salt, peppercorns, tea, decorated belts, shells, alcohol, cigarettes, silk, candy, nails, cocoa beans, cowries and barley. Several types of commodity money were sometimes used together, with fixed relative values, in various commodity valuation or price system economies.
Commodity money is to be distinguished from representative money, which is a certificate or token which can be exchanged for the underlying commodity, but only by a formal process. A key feature of commodity money is that the value is directly perceived by its users, who recognize the utility or beauty of the tokens as goods in themselves.
Since payment by commodity generally provides a useful good, commodity money is similar to barter, but is distinguishable from it in having a single recognized unit of exchange. Radford (1945) described the establishment of commodity money in P.O.W camps.
People left their surplus clothing, toilet requisites and food there until they were sold at a fixed price in cigarettes. Only sales in cigarettes were accepted – there was no barter [...] Of food, the shop carried small stocks for convenience; the capital was provided by a loan from the bulk store of Red Cross cigarettes and repaid by a small commission taken on the first transactions. Thus the cigarette attained its fullest currency status, and the market was almost completely unified.
Radford documented the way that this 'cigarette currency' was subject to Gresham's law, inflation, and especially deflation.