Relative purchasing power parity relates the change in two countries’ expected inflation rates to the change in their exchange rates. Inflation reduces the real purchasing power of a nation’s currency. If a country has an annual inflation rate of 10%, that country’s currency will be able to purchase 10% less real goods at the end of one year. Relative purchasing power parity examines the relative changes in price levels between two countries and maintains that exchange rates will change to compensate for inflation differentials.

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