When the value of the euro fell below a dollar, it was virtually certain to appreciate, because it is rare for the currencies of rich countries to deviate so far from purchasing power parity for long.

• 当欧元币值降至美元以下时，几乎可以肯定欧元会升值，因为富裕国家的货币很少会长期如此大幅度地偏离其购买力平价。