 Commodity money is money whose value comes from a commodity of which it is made. Commodity money consists of objects that have value in themselves in intrinsic value as well as value in their use as money. Examples of commodities that have been used as mediums of exchange include gold, silver, copper, salt, peppercorns, tea, large stones such as bright stones decorated belts, shells, alcohol, cigarettes, cannabis, silk, candy, nails, cocoa beans, calories and barley. These items were sometimes used in a metric of perceived value in conjunction to one another, in various commodity valuation or price system economies. Commodity money is to be distinguished from representative money which is a certificate award token which can be exchanged for the underlying commodity, but only as the trade is good for that source and the product. A key feature of commodity money is that the value is directly perceived by the users of this money, who recognize the utility or beauty of the tokens as they would recognize the goods themselves. That is, the effect of holding the token for a barrel of oil must be the same economically as actually having the barrel at hand. This thinking guides the modern commodity markets, although they use a sophisticated range of financial instruments that are more than one-to-one representations of units of a given type of commodity.