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Grade 6-8

The Opportunity Cost of a Lifetime

Updated: August 4 2015,
Author: Conor Irons


View Interactive Activity

1. How many sodas can you buy instead of one movie ticket?

2. How many pieces of gum can you buy instead of one soda?

3. If you buy four pieces of gum, how many sodas could you have bought?

In order to buy a movie, you need to give up a certain amount of gum and soda. If you buy ten pieces of gum, you give up going to the movie or buying soda. Decisions involve trade offs. When you make a choice, you give up an opportunity to do something else. The highest-valued alternative you give up is the opportunity cost of your decision. Opportunity cost is the highest-valued forgone activity. It is not all the possible things you have given up.

For example, if you go to the movies you have to give up a certain amount of gum and soda. If you are a sodaholic, you have to give up five sodas. If you are gum fanatic, you surrender ten packs of gum. But, the opportunity cost of a movie is not five sodas and ten packs of gum. It is five sodas or ten packs of gum.

Task List

In this lesson you will define opportunity cost, determine the opportunity cost and trade-offs for certain decisions, and select criteria important for decision making.


Go to the Pokemon Guide and answer the following questions.

View Interactive Activity 1. What is the opportunity cost of an unlimited edition Mewtwo in terms of other Pokemon cards?

2. Go back to the gum, soda, movie ticket example. What is the opportunity cost of an unlimited edition Mewtwo in terms of movie tickets?

All kinds of decisions involve opportunity costs, not just ones about how to spend your money. For example, if you have soccer practice when your favorite television show is on, part of the opportunity cost of soccer practice is missing that television show. When you made the choice to join a soccer team, you had to trade-off missing that television show for becoming a better player.

Go to this Calvin and Hobbes website .

View Interactive Activity

1. In the first panel, what does Calvin want to do with the ball?

2. Using the ideas of trade-offs and opportunity cost, explain why Calvin gives Hobbes the ball.

Assessment Activity

All economic questions and problems arise from scarcity. Economics assumes people do not have the resources do satisfy all of their wants. Therefore, we must make choices about how to allocate those resources. We make decisions about how to spend our money and use our time. This EconomicsMinute will focus on the central idea of economics- every choice involves a cost.

Let’s say you have five dollars. What would you like to spend it on? There are a million things you would love to spend five bucks on, but let’s imagine there are only three things out there you really want to buy: gum, soda, and movie tickets. Look at the price chart below and answer the questions.

  • What would you spend your five dollars on?
  • What would you be willing to give up?




$ .50



Movie Ticket



Extension Activity

You won a radio station contest and you are now $300 dollars richer. You can finally start looking for a new stereo. Determine what criteria you think are important for choosing a stereo and identify the trade-offs made when selecting one stereo over another.