Suppose the minimum possible price of constructing homes is $50 per square foot. As a result of a sharp drop in the demand for home construction, the equilibrium price of home construction falls to $40 per square foot. Assuming the home construction industry is perfectly competitive and there are no specialized inputs, firms will:

some firms will exit the industry

Explanation:

if the minimum possible price of constructing homes = $50 per square foot, it means that the marginal cost of building a square foot is $50. If the selling price is less than the marginal cost, then some firms will inevitably have to exit the industry. No firm can remain at an industry when its marginal costs are higher than its marginal revenue.

As supply lowers, the equilibrium price should increase, and some firms might return to the industry.  

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