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 market commodities derivatives declined by two-thirds as investors reduced risk following a five-fold increase in the previous three years. Money under management more than doubled between 2008 and 2010 to nearly $380 billion. Inflows into the sector totaled over $60 billion in 2010, the second highest year on record, down from $72 billion the previous year. The bulk of funds went into precious metals and energy products. The growth in prices of many commodities in 2010 contributed to the increase in the value of commodities funds under management. A commodity contract for difference (CFD) is a derivative instrument that mirrors the