Geary-Khamis dollar

The Geary-Khamis dollar, also known as the international dollar is a sophisticated aggregation method for calculating economic comparisons between countries. It is based on the twin concepts of purchasing power parities of currencies and the international average prices of commodities. The year 1990 is often used as a benchmark year for comparisons that run through time.

It was proposed by Roy C. Geary in 1958 and developed by Salem Hanna Khamis in 1970 to 1972.