Microeconomics 6th Edition by Robert Hall, Shirley Kuiper, Marc Lieberman

تمرين 5

Last year,Pat and Chris occupied separate apartments. Each consumed 400 gallons of hot water monthly. This year,they are sharing an apartment. To their surprise,they find that they are using a total of 1,000 gallons per month between them. Why? What concept discussed in this chapter is illustrated by this example?