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In economics, a government monopoly (or public monopoly) is a form of coercive monopoly in which a government agency or government corporation is the sole provider of a particular good or service and competition is prohibited by law. It is a monopoly created by the government. (Wikipedia)

By World War I most nations had a legalised government monopoly on bank notes. (BBC News)

Two years before, Gandhi had embarked on his most striking protest against British rule: the Salt March, in defiance of a government monopoly on salt which provided about three per cent of the raj's revenue. (The Telegraph)