7. Go to two stores: a supermarket and a convenience store.

a. Write down the cost of a gallon of milk in each.

b. The prices are most likely different. Using the terminology used in this chapter, explain why that is the case and why anyone would buy milk in the store with the higher price.

c. Do the same exercise with shirts or dresses in Walmart

(or its equivalent) and Saks (or its equivalent).