The following table displays hypothetical annual total costs and total benefits of conserving wild tigers at several possible worldwide tiger population levels.

a. Calculate the marginal costs and benefits.
b. Given the data, what is the socially optimal world population of wild tigers?
c. Suppose that tiger farming is legalized and that this has the effect of reducing the marginal cost of tiger conservation by $15 million for each 2,000-tiger population increment in the table. What is the new socially optimal population of wild tigers?

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Population of Wild Tigers Total Cost ($ millions) 2,000 4,000 6,000 8,000 10,000 12,000 0 25 35 50 75 110 165 Total Benefit $ millions) 40 90 130 160 185 205 215