When a competitive market comes under the control of a monopoly, the quantity and price change from:

Explanation:

Firms maximise their profit by supplying at the point where marginal revenue equals marginal cost.

In a Perfect competition, the Demand curve is also the Average revenue as well as the Marginal Revenue curve. As such, the company will sell where the marginal cost curve intersects with the Demand curve which was at point E. The price will therefore be at point B.

When the firm comes under a monopoly, it will start to supply as a monopoly does. In the Monopoly, the Marginal revenue curve is less than the demand curve and so the point where the MC curve intersects with the MR curve is the quantity they will supply at. That point is D. The price will be where this quantity intersects the demand curve which is at point A

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