Precious metal "precious" metal can also be determined by high demand or market value. Precious metals in bulk form are known as bullion and are traded on commodity markets. Bullion metals may be cast into ingots or minted into coins. The defining attribute of bullion is that it is valued by its mass and purity rather than by a face value as money. The level of purity varies from issue to issue. "Three nines" (99.9%) purity is common. The purest mass-produced bullion coins are in the Canadian Gold Maple Leaf series, which go up to 99.999% purity. A 100% pure bullion is
Commodity money 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 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 a token for a barrel of oil must be the same economically as actually having the barrel at hand. This thinking guides the