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Why do people buy US dollars on the black market?
The main reason people buy dollars (or other currency) on the black market is because they are prevented from exchanging currency on the official government market. Venezuela for example restricts citizens to a maximum number of dollars the citizen can buy or sell per year, depending on various factors such as whether or not the person is studying at a foreign university. If the citizen wants to exchange more dollars than legally allowed, that person must buy or sell at the "black" market rate, rather than through the official/government market.