In the United States, say gasoline costs consumers about $2.50 per gallon. In Italy, say it costs consumers about $6 per gallon. What effect does this price differential likely have on:

a. The size of cars in the United States and in Italy?

b. The use of public transportation in the United States and in Italy?

c. The fuel efficiency of cars in the United States and in Italy?

d. What would be the effect of raising the price of gasoline in the United States to $5 per gallon?