问题详情

The relative purchasing power parity theory postulates that______.
A．the equilibrium exchange rate is equal to the ratio of the price level in the two nations
B．the change in the exchange rate over a period of time should be proportional to the relative change in the price level in the two nations over the same time period
C．change in the exchange rate over a period of time should be proportional to the absolute change in the price level in the two nations over the same time period
D．the exchange rate at a period of time should be proportional to the relative prices in the two nations请帮忙给出正确答案和分析，谢谢！