Marginal costs are a function of the total cost of production, which includes fixed and variable costs. Fixed costs of production are constant, occur regularly, and do not change in the short-term with changes in production. ... By contrast, a variable cost is one that changes based on production output and costs.

Is variable cost equal to marginal cost?

Variable cost refers to costs that change as the total level of output changes. Marginal cost refers to the additional cost incurred for producing each additional unit of the product. ... In this instance, marginal cost = variable cost. Thus, the statement "marginal cost is never equal to variable cost" is false.

How does variable cost affect marginal cost?

Fixed costs do not affect the marginal cost of production since they do not typically vary with additional units. Variable costs, however, tend to increase with expanded capacity, adding to marginal cost due to the law of diminishing marginal returns.