If you buy something, you are never ripped off, at least according to the way economists think. If you are willing to spend the money for something, then it has at least that much utility to you. Think about the following three situations:

• In this very moment
• A baseball game in a ballpark that does not allow outside food and drink
• The end a three-mile hike in the desert when you forgot water

In each situation, how much would you be willing to pay for the first bottle of water? Would you buy a second bottle of water? If so, how much would you pay? Discuss how utility changes in different circumstances and with each additional unit you buy.