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21 May, 19:11

what should a firm do if the marginal product obstained from the last dollar spent on capital is smaller than the marginal product derived from the last dollar spent on labor and why

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  1. 21 May, 21:58
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    Answer: The firm should minimize cost and always seek a mix of inputs, L and K,

    such that the marginal products per dollar spent on each should be equal.

    Explanation:

    Spending one dollar less on capital will reduce output by capital's marginal product per dollar. But because the marginal product per dollar for labor is greater than that for capital, less than a dollar's worth of labor must be bought to achieve the desired output.

    If a firm uses two inputs, labor and capital, that can be bought

    at fixed prices P (L) and P (K). We can find (for any amounts of the inputs) the marginal

    product of, say, L as the increase in output achieved from employing an extra unit of

    labor, holding capital constant. The marginal product per dollar spent on labor is

    therefore MP (L) / P (L). This is the increase in output the firm can achieve from spending

    another dollar on labor. Similar definitions hold for capital.
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