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      Question

      The "Output Elasticity of Total Cost" (Ec) is defined as

      the ratio of Marginal Cost to Average Total Cost (MC/ATC). If Ec < 1, the firm is experiencing:
      A Diseconomies of Scale Correct Answer Incorrect Answer
      B Economies of Scale Correct Answer Incorrect Answer
      C Constant Returns to Scale Correct Answer Incorrect Answer
      D Diminishing Marginal Returns Correct Answer Incorrect Answer

      Solution

      If MC is less than ATC (making the ratio < 1), the ATC curve must be falling. A falling average cost as output increases is the definition of Economies of Scale. Conversely, if Ec > 1, the firm faces diseconomies.

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