Which of the following must be true if average total costs are rising?

A) Average fixed costs must be rising.
B) Total fixed costs must be rising.
C) Average variable costs must be falling.
D) Marginal costs must be greater than average total costs.

Average Total Costs

The total cost of production divided by the number of units produced, representing the per-unit production cost.

Marginal Costs

The charge for generating one more unit of a product or service.

Average Fixed Costs

The total fixed costs of production divided by the quantity of output produced, indicating how fixed costs change with different levels of production.