The marginal cost of production shows the change in a firm's total cost from producing one more unit of a good or service. what is the shape of the marginal cost curve? graphically, the marginal cost curve is
a. shaped like a hill, initially rising when the marginal product of labor is falling and then eventually falling when the marginal product of labor is rising.
b. a u shape, initially falling due to diminishing returns and then eventually rising due to specializationspecialization.
c. a u shape, initially falling when the marginal product of labor is rising and then eventually rising when the marginal product of labor is falling.
d. a u shape, initially falling when the marginal product of labor is below marginal cost and then eventually rising when the marginal product of labor is above marginal cost.
e. shaped like a hill, rising when the average cost of production is rising and then eventually falling when the average cost of production is falling.

Graphically, the marginal cost curve is a u shape. It is U-shaped because, at the start, there is increasing marginal returns which cause falling marginal cost and a downward-sloping marginal cost curve. Later, diminishing marginal returns cause rising marginal cost and an upward-sloping marginal cost curve.

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