Gold standard, that is, gold is the standard currency. In the Bretton Woods system, all countries use gold as the pricing standard of their own currencies. Assuming that RMB 200 yuan is equivalent to 1 g of gold and US dollar 40 yuan is equivalent to 1 g of gold, the exchange rate between RMB and US dollar is 1 US dollar =5 RMB, that is, gold is used as the intermediate benchmark for exchange rate calculation.

The dollar standard system takes the dollar as the intermediate benchmark for calculating the exchange rate. Assuming that 100 RMB is equivalent to US$ 20 and 10 yuan RMB is equivalent to US$ 20, then 1 RMB is equivalent to 10 yuan RMB.