Refer to Figure 4-1. If the market price is $2.50, what is the consumer surplus on the second ice cream cone?

When a market is efficient, the

A) sum of consumer surplus and producer surplus is maximized. B) deadweight gain is maximized. C) quantity produced is maximized. D) marginal benefit of the last unit produced exceeds the marginal cost by as much as possible. E) total benefit equals the total cost.

In the above figure, if the demand curve is D2, then

A) the equilibrium price will be P1 and the equilibrium quantity will be Q2. B) the equilibrium price will be P1 and the equilibrium quantity will be Q1. C) there will be a shortage equal to Q2 - Q1. D) an increase in price will shift the demand curve to D3.