Describe some of the trade-offs faced by each of the following: 

a. A family deciding whether to buy a car.

b. A member of Congress deciding how much to spend on national parks.

c. A company president deciding whether to open a new factory.

d. A professor deciding how much to prepare for class. 

e. A recent college graduate deciding whether to go to graduate school.

f. A single parent with small children deciding whether to take a job.