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A currency that may not be converted into another currency on the foreign exchange market, or that may be converted only in limited amounts. Some countries limit convertibility to prevent citizens from making bad investment decisions in, say, a country experiencing hyperinflation, while a few communist countries issue nonconvertible currencies to protect their citizens from capitalist influences. A nonconvertible currency is generally traded only on the black market. It is also called a blocked currency or an inconvertible currency.