If the average cost of producing 9 sweaters is $6. 50 and the marginal cost of producing the tenth sweater is $6. 25, the average cost of producing 10 sweaters will be less than $6.50
If marginal cost is less than average cost, average cost will decrease and therefore be less than $6.50. In this case, average cost of producing 10 sweaters is ($6.50 x 9 + $6.25)/10 = $6.48.
The marginal cost is the variation in total cost brought on by an increase in output, or the cost of producing more. In certain contexts, it might refer to an increase in output of one unit, while in others, it can relate to the rate of change of total cost as output grows by a modest amount.
The total cost is expressed in dollars, whereas the marginal cost is expressed in dollars per unit. The marginal cost is the slope of the total cost, or the rate at which it increases with production.
Marginal cost is the distinction between average cost, which is the total cost divided by the number of units produced.
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