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 currency deflation. This can have negative or positive effects depending on whether the currency was overvalued or not, deflation can either be positive or negative in the long run as suggested by the effects section of the deflation article. It is important to note that while countries with commodity currencies benefit from the higher demand, countries that import this commodity face the opposite effects. Commodity currencies nature can allow foreign exchange traders to better gauge the value of a currency and predict the movements within the markets based on the perceived value of the commodity to which the currency is tied.