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Suppose 10 people each have the demand Q=20 - 4P for streetlights and 5 people have the demand Q=18 – 2P for streetlights

Economics

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Suppose 10 people each have the demand Q=20 - 4P for streetlights and 5 people have the demand Q=18 – 2P for streetlights. The cost of building each streetlight is 3. If it is impossible to purchase a fractional number of streetlights, how many streetlights are socially optimal? (20 points)