Answer all questions on this sheet of paper and turn it in in-class or on Blackboard. Do NOT email it to me or the TA. Make your
answers clear, legible and to the point.
1. (15 points) A city is considering adopting a motorcycle helmet law. This law will reduce injury and death from accidents
involving motorcycles. When motorcyclists are injured and are uninsured local hospitals bear the cost of treatment in cases where the
cyclist cannot pay. If you currently enjoy riding your motorcycle without your helmet, what are the relevant categories of costs and
benefits of the proposed law from your(private) perspective (assume that the penalties for riding without a helmet are severe enough
that you comply with the law)? How do these benefit and costs differ from those in a social benefit-cost analysis perspective?
2. (25 pts.) A foreign company plans to clear several dozen acres of ecologically valuable mangrove swamp in Vietnam for the
creation of a shrimp aquaculture facility. This decision will create economic profits of $15,000/year to the company (which hires
substantial numbers of local villagers) after one year of construction but will cost $100,000 (paid upfront) to build.
a. (8 pts.) Assume that the discount rate is 4% (r=.04) and the evaluation horizon is 10 years from the present. Please neatly
fill the blanks in the table below, taking into account only the benefits and costs described above.
Time Benefits Costs Net Benefits Discounted Net Benefits
1
2
3
4
5
6
7
8
9
10
b. (7 pts.) What is the net present value of this proposed project? If efficiency was the only objective for making the decision
would the preceding analysis justify moving forward with the project from a private benefit cost perspective?
c. (2 pts.) At what discount rate would this project just break even (this is easily done by trial and error using a spreadsheet)?
d. (8 pts.) A study reveals that the loss of the mangrove habitat will reduce spawning and nursery habitat for valuable fish
species – thus reducing the catch of fish by artisanal fishermen in another village from 1000 tons to 700 tons per year (which has a
market value, after costs, of $10/ton). Assume that these losses are experienced from the very first (construction) year onward and
are permanent. Redo the table from part a to incorporate this additional cost and calculate the net present value of the project. How
(if at all) does your conclusion from part b change on the basis of this social benefit cost analysis?
Time Benefits Costs Net Benefits Discounted Net Benefits
1
2
3
4
5
6
7
8
9
10
3. (25 points) The government of a small South Pacific island is considering whether to allow development of a small but valuable
deposit of phosphate rock. Not having the resources to develop and mine the deposit themselves, the country has the option to sell a
lease to a foreign mining company for an immediate one-time fee of $13 billion – resources that can be used to address many development
challenges in the country . The lease will expire (and the deposit will likely be mined out) in 20 years. A panel of experts suggests
that the mining of the phosphate, despite the use of best practices to avoid contamination, will eventually result in contamination of
surface and groundwater supplies in a manner that will increase health risks for some residents. Best estimates of these health-related
damages(willingness to pay to avoid the damage) are a total of $30billion. Moreover, the health effects are not likely to be
experienced until the end of the 20 year lease.
a. (10 points) Suppose that the government of the island can earn a rate of return of .05 (5%) on their other investments. What
is the present value of the damages created by the project? What is the net present value of the project from the vantage of the
government? Assuming this is the best (i.e. most efficient) way to develop the phosphate resource, is doing so justifiable on the
basis of economic efficiency?
b. (5 points) Find the breakeven discount rate such that the net present value of this development opportunity is zero (i.e. find
the internal rate of return).
c. (5 points) The government of the country has decided to allow the project to go forward. However, as a measure to deal with
perceived inequities across generations, they decide to invest a substantial portion of the lease payment. Assume that $12 billion is
invested at a 5% annual rate (compounded annually). Will the future value of this investment be sufficient to compensate those that
suffer damages in year 20?
d. (5 points) Read the provided excerpt from Goodstein’s text. How does the “environmental bond” discussed in c) help to foster
sustainability in the sense of equity across generations?
4. (10 pts.) You perform a travel cost study that looks at the relationship between the cost of visiting a lake (including costs
of travel, value of time spent not working & any entry fees), its water quality (measured by the concentration of fecal coliform
bacteria) and the actual numbers of visitors. Circle the categories of values (willingness-to-pay) that this method can potentially
uncover for individuals (there may be more than one).
a. Changes in recreational use value related to planned improvements in water quality
b. Reductions in consumer welfare from increasing the entrance fee
c. Benefits to homeowners that never use the lake but enjoy views of the lake and have increased property values due to their
proximity to the lake
d. Changes in the non-use value of the lake as its perceived quality changes
5. (25 pts.) The total demand (marginal benefit) curve for visiting Yosemite is as follows: Price = 12,000-20*NumberOfTrips –
50*TonsOfVisibleTrash.
a. (2.5 pts.) Suppose the quantity of trash=100 tons. Draw the demand curve below, being sure to label the axes and the slope and
intercept appropriately.
b. (2.5 pts.) Does the quantity of trash increase or decrease the willingness to pay for an additional trip?
c. (10 pts.) Suppose the park charges an entrance fee of $100. What is the total net benefit to consumers who visit the park (the
“consumer surplus”) if this is the only travel costs (all other costs of the trip are zero)? In answering this question, continue to
assume that the quantity of trash remains 100 tons.
d. (10 pts.) Now assume the park implements a cleanup program to reduce the trash in the park to 20 tons. Assuming the entrance
fee from c) remains the same, what is the new consumer surplus? What was the economic benefit to park visitors from the cleanup
program?
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