The Effect of Discount Rates on Environmentally Friendly Investments and Sustainability:

Suppose that Samantha has just bought an older, uninsulated house. Samantha commissions an energy audit and finds that an adequate insulation job would cost approximately $3,000.

Samantha's career usually requires her to move every five years or so, and realtors have told her not to count on recovering the insulation job in the resale price.