9. Suppose consumers decide they value a product more highly than before. Then the efficient quantity

to produce of that product ____.

a.increases.

b.does not change.

c.decreases.

d.perhaps changes, but without more information the direction of the change cannot be told.

10. Suppose the marginal cost of producing a product rises. Then, the efficient quantity to produce of that

product ____.

a.increases.

b.does not change.

c.decreases.

d.perhaps changes, but without more information

the direction of the change cannot be told.