When the marginal return to the variable factor of production is diminishing,the marginal cost curve is

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When the marginal return to the variable factor of production is diminishing, it means that the marginal product of that factor is decreasing. As a result, additional units of the variable factor of production are adding less and less to total output. This leads to an upward-sloping marginal cost curve, as it will cost more to produce each additional unit of output due to the decreasing marginal productivity of the variable factor.

When the Marginal Return to the Variable Factor of Production