5 What is the quantity of spraying that a private mosquito control programme would provide? What is the efficient quantity of spraying? In a single-issue election on the quantity of spraying, what quantity would the winner of the election provide? 

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Quantity (square miles sprayed per day) 1 Marginal social cost Marginal social benefit (thousands of pounds per day) 2 10 2 4 8 3 6 6 4 8 4 5 10 2