One popular macroeconomic analysis metric to compare economic productivity and standards of living between countries is purchasing power parity (PPP). PPP is an economic theory that compares different countries’ currencies through a “basket of goods” approach.

According to this concept, two currencies are in equilibrium—known as the currencies being  when a basket of goods is priced the same in both countries, taking into account the exchange rates.

In contemporary macroeconomics, gross domestic product (GDP) refers to the total monetary value of the goods and services produced within one country. Nominal GDP calculates the monetary value in current, absolute terms. Real GDPadjusts the nominal gross domestic product for inflation.

However, some accounting goes even further, adjusting GDP for the PPP value. This adjustment attempts to convert nominal GDP into a number more easily comparable between countries with different currencies.