Answer:
B. monopoly firms but not for competitive firms.
Explanation:
Marginal revenue can become negative for monopoly firms but not for competitive firms.
A monopolist’s marginal revenue is always less than or equal to the price of the good.
Marginal revenue is the amount of revenue the firm receives for each additional unit of output. It is the difference between total revenue – price times quantity – at the new level of output and total revenue at the previous output (one unit less).
Since the monopolist’s marginal cost curve lies below its demand curve. When a monopoly increases amount sold, it has two effects on total revenue:
– the output effect: More output is sold, so Q is higher.
– the price effect: To sell more, the price must decrease, so P is lower.
For a competitive firm there is no price effect. The competitive firm can sell all it wants at the given price.
So the marginal revenue on a monopolist's additional unit sold is lower than the price, <u>because it gets less revenue for selling additional units.</u>
<u>Marginal revenue can become negative – that is, the total revenue decreases from one output level to the next.
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