Which of the following is a desirable property of money?

In the above figure, if a subsidy is granted to producers that generates an efficient allocation of resources, then consumers will pay a price of

A) $20 per unit. B) $15 per unit. C) $10 per unit. D) $5 per unit.

The demand curve faced by the individual perfectly competitive firm is:

A) downward sloping. B) upward sloping. C) horizontal. D) vertical.