Suppose that initially the price is $20 in a perfectly competitive market. Firms are making zero economic profits. Then the market demand shrinks permanently, some firms leave the industry, and the industry returns to a long-run equilibrium. What will be the new equilibrium price, assuming cost conditions in the industry remain constant?
A. $20
B. $16
C. Lower than $20 but exact value cannot be known without more information.
D. Larger than $20 but exact value cannot be known without more information.