The Geary–Khamis dollar, more commonly known as the international dollar (Int'l. dollar or Intl. dollar, abbreviation: Int'l$., Intl$., Int$, G-K$ or GK$), is a hypothetical unit of currency that has the same purchasing power parity that the U.S. dollar had in the United States at a given point in time.[1][2] It is widely used in economics and financial statistics for various purposes, most notably to determine and compare the purchasing power parity and gross domestic product of various countries and markets. The year 1990 or 2000 is often used as a benchmark year for comparisons that run through time. The unit is often abbreviated e.g. 2000 US dollar (if the benchmark year is 2000) or 2000 Int'l$.