How a monopoly firm will not achieve allocative efficiency?

Answer:
They produce at a different point than a competitive firm, a monopoly produces at a point where marginal revenue= marginal cost, where a competitive firm equates price to marginal cost.
The marginal cost curve is lower than the demand curve, but the monopoly charges the price at the demand curve, which is a higher price and a lower quantity than a competitive market would produce.
Contributor: Kevin
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