Commodity money as a theoretical backing for federally issued "gold certificates" to substitute for the gold. Between 1933 and 1970 (when the U.S. officially left the gold standard), one U.S. dollar was technically worth exactly 1/35 of a troy ounce (889 mg) of gold. However, actual trade in gold bullion as a precious metal within the United States was banned after 1933, with the explicit purpose of preventing the "hoarding" of private gold during an economic depression period in which maximal circulation of money was desired by influential economists. This was a fairly typical transition from commodity to representative to fiat money,
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