How Does a Purchasing Power Parity Calculator Work?
Purchasing Power Parity (PPP) is an essential macroeconomic concept. It allows economists and individuals to compare the true standard of living between two different countries by bypassing volatile foreign exchange markets. Instead of using trading rates, PPP looks at the actual cost of living.
The Mathematical Formula
The Implied PPP Exchange Rate is calculated using a very simple ratio of costs:
The Big Mac Index
The most famous informal application of PPP is the Big Mac Index created by The Economist. Because a McDonald's Big Mac is made with the exact same ingredients worldwide (bread, meat, vegetables, labor, electricity), comparing its price in the US versus its price in India or Europe gives us a highly accurate picture of true currency valuation and living costs.