The market demand function for ice cream is Qd = 10 - 2P and the market supply function for ice cream is Qs = 4P - 2, where both quantities are measured in millions of gallons per year. What is the consumer surplus at the competitive market equilibrium?
A. $4.5 million
B. $9 million
C. $13.5 million
D. $18 million
Answer: B. $9 million
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