On various international versions of Who Wants to Be a Millionaire?, what determines the size of the top prize, especially if it is greater than one million units of the local currency, often leading to cases of Millionaires who are not Top Prize Winners, are three concepts related to economics and finance: inflation, deflation, and exchange rates. Inflation causes a currency to lose value over time, while deflation causes a currency to gain value over time, and the exchange rate determines a currency's value relative to another currency; for example, the British pound sterling, the euro, and the US dollar are all currencies with high exchange rates, although the pound sterling is worth slightly more than the euro, and the euro is worth slightly more than the US dollar. On the other hand, many Asian, African, and Latin American countries have currencies with relatively low exchange rates; notably, the show has struggled in countries with extreme hyperinflation, such as Vietnam, Venezuela, and Argentina. Increasing the top prize due to inflation is known as adjusting for inflation.
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