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 broker CPO, as well as their RCR/APs, are required to register with the Commodity Futures Trading Commission (CFTC), and be members of the National Futures Association (NFA). Floor brokers/traders who are members or employees of a commodity exchange generally do not need to be members of the NFA, as they are regulated by the exchange. Commodity brokers can trade commodities on various exchanges, which specialize in trading a certain commodity type. The common commodity exchanges include the New York Mercantile Exchange (NYMEX) that trades in a variety of commodities, Chicago Board of Trade (CBOT) that trades in wheat, rice, soybeans, oats,