Eco – case | Economics homework help


Prompt: The objective of this case study is to analyze data and make recommendations for the improvement of the water quality in a local lake.

Describe the required data and the rationale for using the travel cost method. Prepare your analysis as though you were hired by an influential

association of homeowners and businesses that are interested in the local lake’s water quality. The analysis and recommendations you provide

will help determine the benefits for improving the water quality of the lake. You must take the steps listed below to complete this case study.

 Step 1

Describe the rationale for using the travel cost method. Compare the travel cost method to the contingent valuation method in your


 Step 2

Define the zones surrounding the lake. These may be defined by concentric circles around the lake or by geographic divisions.

Choose what makes sense, such as counties or other distinguishable boundaries that surround the lake at different distances. Add a

graphic to enhance the definition and description.

Step 3

Explain how you will collect data. Focus on the number of visitors from each zone and the number of visits made in the last year. For

this example, assume the staff at the lake has records of the number of visitors and their zip codes. This will be used to calculate the

total number of visits per zone over the last year. To extend the value of the analysis, explain the value of more precise data and

what it takes to analyze this additional data. More information on this approach is found on the companion website to the course

textbook (relevant pages for Chapter 7).

 Step 4

Calculate the visitation rates per 1,000 population in each zone. These are the total visits per year designated by each zone, divided

by the zone’s population in thousands. An example is shown below. Use Microsoft Excel (or something similar) to calculate the rates

thousands. An example is shown below. Use Microsoft Excel (or something similar) to calculate the rates.

Visitation Rates per 1,000 Population

Zone Total-0-3

Visits/Year-400 all


Population Visits/1,000

0 400 1,000 400

1 400 2,000 200

2 400 4,000 100

3 400 8,000 50

Beyond 3 0

Total Visits 1,600

Step 5

Calculate the average round-trip travel distance and travel time for each zone. Assume that people in Zone 0 have a travel distance

and time of zero. Every other zone has increasing travel time and distance. Next, using average cost per mile and per hour of travel

time, calculate the travel cost per trip. A standard cost per mile for operating an automobile is readily available from AAA or similar

sources. Assume that cost per mile is $.30, or use the current expense rate found on the IRS website. The cost of time is more

complicated. The simplest approach is to use the average hourly wage. For this example, assume it is $9 per hour (or $.15 per

minute) for all zones, although in practice it is likely to differ by zone. Generate calculations using Microsoft Excel or a similar


Average Round-Trip Travel Distance and Travel Time

Zone Round-Trip Travel



Travel Time

Distance Times



Travel Time







0 0 0 0 0 0

1 20 30 $6 $4.50 $10.50

2 40 60 $12 $9.00 $21.00

3 80 120 $24 $18.00 $42.00

Step 6

For additional practice, add one to two more zones with additional data.

To estimate using regression analysis, use an equation that relates visits per capita to travel costs and other important variables.

From this, estimate the demand function for the average visitor. In this simple model, the analysis might include demographic

variables, such as age, income, gender, and education levels, using the average values for each zone. To maintain the simplest

possible model, calculate the equation with only the travel cost and visits/1,000.

Visits/1,000 = 330 – 7.755*(Travel Cost)

Step 7

Construct the demand function for visits to the lake, using the results of the regression analysis. The first point on the demand curve

is the total visitors to the lake at current access costs (assuming there is no entry fee for the lake), which in this example is 1,600

visits per year. The other points are found by estimating the number of visitors with different hypothetical entrance fees (assuming

that an entrance fee is viewed in the same way as travel costs). Enter the total number of visits.

Demand Function

Zone Travel Cost plus


Visits/1,000 Population Total Visits

0 $10 252 1,000 252

1 $20.50 171 2,000 342

2 $31.00 90 4,000 360

3 $52.00 0 8,000 0

Total Visits

For additional practice, add one to two more sets of data

This gives the second point on the demand curve (enter the sum of the total visits into the gray shaded area). Use the total number

of visits and multiply it by an entry fee of $10. Then calculate in the same way for the number of visits at each of the increasing entry

fees to get the totals listed below. (Use a program such as Microsoft Excel to enter data and then plot a graph.)

Entry Fee Total Visits

$20 409

$30 129

$40 20

$50 0

This points give the demand curve for trips to the lake

 Step 8

Now estimate the total economic benefit of the lake by calculating the consumer surplus (or the area under the demand curve). This

results in a total estimate of economic benefits from the lake uses around $23,000 per year, or around $14.38 per visit

($23,000/1,600). Remember that the objective is to determine whether it is worthwhile to spend money to protect the lake by implementing programs to improve the water quality. If the actions cost less than $23,000 per year, the cost will be less than the

benefits provided by the lake. If the costs are greater, the staff will decide whether other factors are worthwhile. You should make

recommendations that will influence a decision on whether it is worthwhile to spend money on programs to improve the water

quality of the lake over the long run and the short run. Also make recommendations on the additional information to gather in a

survey to enhance this study. Create a report with recommendations based on your analysis.

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