金本位
A "full or 100%-reserve" gold standard exists when the monetary authority holds sufficient gold to convert all the circulating representative money into gold at the promised exchange rate. It is sometimes referred to as the gold specie standard to more easily distinguish it. Opponents of a full standard consider it difficult to implement, saying that the quantity of gold in the world is too small to sustain worldwide economic activity at or near current gold prices; implementation would entail a many-fold increase in the price of gold. Gold standard proponents have said, "Once a money is established, any stock of money becomes compatible with any amount of employment and real income." While prices would necessarily adjust to the supply of gold, the process may involve considerable economic disruption, as was experienced during earlier attempts to maintain gold standards.