Définition
Purchasing power parity (PPP) is a money conversion rate used to express the purchasing powers of different currencies in common units. This rate expresses the ratio between the quantity of monetary units required in different countries to purchase the same "basket" of goods and services.
This conversion rate maybe different from the "exchange rate", as the exchange rate of one currency in relation to another reflects their reciprocal values on the international financial markets and not their intrinsic values to a consumer.