The MR curve of a monopoly firm is downward sloping.
While a monopolist's marginal revenue curve slopes downward, that of a competitive firm is horizontal and straight. A completely competitive firm has a marginal revenue that is equal to its price. One way to represent this is as a horizontal straight line. Whereas, monopolists, have a marginal revenue curve that slopes downward.
The MR curve of a monopoly is downward-sloping as a monopolist is typically the only seller in the market. As the monopolist increases the quantity of goods sold, the price of the goods must be reduced to find buyers for the additional units. This means that the revenue earned from each additional unit sold is less than the revenue earned from the previous unit, resulting in a downward-sloping MR curve.
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