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80 In 1984, British Prime Minister Margaret Thatcher decided to shut down so-called uneconomic coal mines owned by the government. The National Union of Mineworkers protested, asserting that there was enough coal in the mines to continue current levels of production for years. Thatcher implicitly argued that her decision was economically sound because, at any practical level of output, for each "uneconomic" mine, a. MC > AC. b. for every input, MPP > APP. c. MC> MR. d. AC > MC