"Let's assume that the government decides to regulate a natural monopoly by forcing them to produce at a point where the natural monopoly's demand curve intersects average cost. In this case, the price will and the quantity will when compared to the natural monopoly if it were allowed to operate unregulated."

fall; rise

Explanation:

A natural monopoly is a form of monopoly that has a high cost, huge capital base and also a strong economies of scale.

If the government decides to regulate a natural monopoly by forcing them to produce at a point where the natural monopoly's demand curve intersects average cost.

This will lead to a fall in price and there will be a rise in quantity when compared to the natural monopoly if it were allowed to operate unregulated."

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