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Every Choice Has a Cost

A Money Detectives lesson. This page is for grown-ups: preview it before your kid plays, or talk about it after.

When you choose, you give something up. The best thing you gave up is the opportunity cost.

For ages 8–10 (grades 3–5) · about 15 minutes · read-aloud on every screen

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What your kid learns

  • Not enough for everything

    Money runs out. Time runs out, too. That’s called scarcity. So every choice means giving something up.

  • The best thing you gave up

    Say you pick soccer over a movie. The movie is your opportunity cost. It’s the best thing you didn’t pick.

  • Good choosers compare

    Compare what you get with what you give up. Time counts, too. Then choose what matters most to you.

The story: The Case of the Busy Saturday

At the park, Amara picks soccer over a movie on Saturday, and Jo helps name what was given up.

  1. Helper: A new case! Amara has one free Saturday afternoon.
  2. Amara: Soccer with friends, or a movie? Both start at the same time.
  3. Jo: You can’t do both. Time runs out.
  4. Amara: I pick soccer. It’s free, and I love it.
  5. Jo: Then the movie is what you gave up.
  6. Amara: So the movie is my opportunity cost!
  7. Helper: Case closed! Every yes is a no to something else.

The game: Choose-Your-Path Saturday

You have a pretend $10 and a free Saturday. Pick a path. See what you get and what you give up.

Games use pretend money and work with taps or a keyboard. Nothing is timed.

New words

scarcity
not enough for everything
trade-off
giving up one thing to get another
opportunity cost
the best thing you gave up when you chose

Questions at the end

  • Mei picks art class over swimming. What is the opportunity cost?
  • Leo plays games for an hour instead of reading. What did Leo spend?
  • What does scarcity mean?

Remember this

Every yes is a no to something else.

Talk about it

Share one trade-off you made this week and what you gave up.

Try it at home: Name the trade-off

  1. Next time you choose, say what you’re giving up.
  2. Teach a grown-up: ask what they gave up for their last choice.
  3. Name the opportunity cost together.

Next time you choose, say what you’re giving up. Teach a grown-up: ask what they gave up for their last choice. Then name the opportunity cost together.

School standards

  • National Standards for Personal Financial Education: Spending
  • Common Core Math 4.OA.A.3

Builds on

Leads to

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Lessons teach how money works. They are not financial advice.