Marginal cost is the:

A) increase in total cost when one more unit of output is produced.
B) reduction in cost from economies of scale.
C) ratio of average total cost to total cost.
D) increase in output from the addition of one unit of labor.

Marginal Cost

The outlay for creating another unit of a product or service.

Economies of Scale

Cost advantages that enterprises obtain due to their scale of operation, with cost per unit of output generally decreasing with increasing scale.

Output

The total amount of goods or services produced by a company, industry, or economy within a specific period.