ECN437Marginal Social Benefit

# ECN437Marginal Social Benefit - redeveloping part of an old...

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ECN437 Marginal Social Benefit Marginal social benefit is equal to the private marginal benefit a good  provides plus any external benefits it creates. In other words, MSB gives the  total marginal benefit of the good to society as a whole. In mathematical  notation: MSB = MBprivate + MBexternality It is used for evaluating efficiency in the presence of positive externalites. When calculating MSB, be sure to add the individual marginal benefits  "vertically". That is, be sure that you are adding up the marginal benefits  produced by each unit of the good. In mathematical terms: MSB(Q) = MBprivate(Q) + MBexternality(Q) As an example, suppose a company is thinking about buying and
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Unformatted text preview: redeveloping part of an old abandoned industrial site near the center of a city. Such areas are called "brownfields" and are a big problem for many cities because they are unsightly and may be polluted. Redeveloping them often produces big external benefits. Suppose in this case the marginal benefit the firm gets is given by the function: MBp(Q) = 2000 - 5Q where Q is the number of acres redeveloped. In addition, redeveloping gives the city \$100 of external benefits per acre: MBe(Q) = 100 The MSB of redevelopment are given by: MSB(Q) = MBp(Q) + MBe(Q) = (2000 - 5Q) + 100 = 2100 - 5Q...
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