首先，与货币存量保持不变的情况相比，货币存量的上升必然导致一个货币单位的购买力受损。

First and foremost, a rise in the money stock necessarily leads to an impairment of the purchasing power of a money unit - compared with a situation in which the money stock remains unchanged.

youdao

2009年全球产出大约减少了1%还多(基于平价购买力不变的情况下)——这是自1945年以来全球经济产出第一次切实的减少。

In 2009 world output probably shrank by more than 1% (on a purchasing-power-parity basis) -the first time since 1945 that the global economy actually got smaller.

youdao

但货币的价值并不总是稳定不变的，货币的购买力会随着通货膨胀或通货紧缩而产生变化。

Nevertheless, the value of money is not constant over time. The purchASing power of money changes AS a result of either inflation or deflation.

youdao