For a given supply of money, an increase in the production of goods will increase the value of a currency, because each unit will buy more goods. Likewise, increasing the supply of money relative to a fixed amount of output will lead to a decline in the purchasing power of money, as each currency unit buys fewer goods.
其实，一个国家货币的价值与其说是由该国的经济状况决定的，还不如说是由外汇市场上的供求关系决定的。货币供应量固定，商品生产增加，则货币价值上升，因为单位货币能买到的商品更多。同样，在产出固定的情况下增加货币供应会导致货币购买力下降，因为单位货币能买到的商品减少。