The market for flu shots during late fall is shown in the following table:

Suppose the community derives a positive externality of $10 for every flu shot administered. What is the extent of market failure in this situation? What price and quantity does the market generate, and what price and quantity should it generate to achieve an efficient use of resources? How can this outcome be obtained?

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QUANTITY QUANTITY PRICE $50 40 30 20 10 DEMANDED 1,000 3,000 5,000 7,000 9,000 SUPPLIED 9,000 7,000 5,000 3,000 1,000