In economics, the marginal cost (MC) is calculated by finding the change in total cost when producing one additional unit of a good or service. This is done by dividing the change in total cost by the change in quantity produced.
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MC = f'(x) = df/dx Marginal cost is equivalent to the derivative of the cost function.
At first, marginal cost decreases due to specialization of workers. Then, MC begins to increase steadily. The only benefits of MC are in the period of specialization.
because mc=mb
The marginal cost (MC) curve intersects the average variable cost (AVC) curve at the minimum point of the AVC curve.
Overall because of diminishing marginal returns. The marginal cost curve, MC, decreases until diminishing marginal returns set in and and it begins to increase. When the MC is below the AVC, the AVC must fall. When the MC is above the AVC, the AVC must rise. In otherwords, if the marginal cost is decreasing the average cost must be decreasing as well and vice versa.