A monopolist's profit-maximizing level of output is inefficient because the marginal cost of the last unit produced is less than the marginal benefit.
Monopolist's profit-maximizing level of output
For a monopolist's profit-maximizing level of output to be efficient, marginal cost and marginal revenue must equate or must be the same.
In a situation where marginal cost is less than or lower than marginal benefit or marginal revenue, this tend this tend to lead to inefficiency.
Inconclusion a monopolist's profit-maximizing level of output is inefficient when marginal cost is less than the marginal benefit.
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