Purchasing power parities (PPPs) represent an important contribution of price statistics in international economic comparisons. PPPs tell us how many currency units a given quantity of goods and services costs in different countries. PPPs can thus be used to create meaningful indicators that are necessary for cross-country comparisons and that truly reflect differences in purchasing power. They are calculated from an international basket of comparable goods and services and serve as indicators of price level differences between countries. Thus, if the price level index (PLI) is greater than 100, the country in question is “more expensive”; if the price level index is less than 100, it is “cheaper” than the country with which it is being compared. PPPs are calculated by Eurostat in cooperation with the OECD and in close collaboration with the statistical institutions of currently 37 participating countries within the European Comparison Programme (ECP).