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 consumer population centers. A swap is a derivative in which counterparties exchange the cash flows of one party's financial instrument for those of the other party's financial instrument. They were introduced in the 1970s. Exchange-traded commodity is a term used for commodity exchange-traded funds (which are funds) or commodity exchange-traded notes (which are notes). These track the performance of an underlying commodity index including total return indices based on a single commodity. They are similar to ETFs and traded and settled exactly like stock funds. ETCs have market maker support with guaranteed liquidity, enabling investors to easily invest in commodities.