take the case of a monopolistic firm. what kind of demand curve is a monopolist facing compared to a perfectly competitive firm

A company that sells a specific product alone in a market is said to have a monopoly in that market. A monopolist encounters a different demand curve than a properly competitive firm as it is the only supplier in the market. There are numerous firms producing the same goods in a completely competitive market, and each firm is a price taker, which means it must accept the market price for its goods. Here, the demand curve that a perfectly competitive firm must deal with is perfectly elastic, which means that even tiny changes in price will have a substantial impact on the quantity of the firm's product that is desired

Whereas, because it has some market power and can control the price of its goods, a monopolistic firm is faced with a downward-sloping demand curve. This indicates that even if the amount demanded would drop as the price rises, the monopolist can charge a higher price and still sell part of its goods.