For a monopolist,the market demand curve:

A) is also the demand for the monopolist's product.
B) is equal to the monopolist's MR curve.
C) must be horizontal.
D) is not important since the monopolist is the only producer.

The market demand curve represents the demand for the monopolist's product because the monopolist is the only producer in the market. The monopolist sets the price based on the market demand curve, which shows the quantity of the product that consumers are willing and able to buy at different prices. Therefore, the monopolist's demand curve is the same as the market demand curve.