What is the marginal revenue of a monopolist is?

The marginal revenue of a monopolist is the additional revenue generated from selling one more unit of a good or service. Unlike in perfect competition, a monopolist faces a downward-sloping demand curve, which means that to sell more units, it must lower the price on all units sold. As a result, marginal revenue is less than the price at which the additional unit is sold. This relationship is key to understanding a monopolist's pricing and output decisions.