After the first unit sold,the marginal revenue a monopolist receives from selling one more unit of a good is less than the price of that unit because of:

A) diminishing marginal returns.
B) increasing marginal cost.
C) a downward-sloping demand curve.
D) declining average fixed cost.

Downward-Sloping

Characteristic of a graph or curve that shows a decrease in one variable as another variable increases, commonly seen in demand curves.

Marginal Revenue

The extra revenue earned by selling an additional unit of a product or service.

Demand Curve

A graphical representation showing the relationship between the price of a good and the amount of it that consumers are willing and able to purchase at each possible price.