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    Question

    Marginal physical product of a variable input is

    negative
    A Only in 1st stage Correct Answer Incorrect Answer
    B Only in 3rd stage Correct Answer Incorrect Answer
    C Only in 2nd stage Correct Answer Incorrect Answer
    D In 2nd and 3rd stage Correct Answer Incorrect Answer
    E None of the above Correct Answer Incorrect Answer

    Solution

    The correct answer is B

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