The school fair
You have money for two goes on the stalls. There are three you want: the hoopla, the cake stall, and the lucky dip.
Which two do you pick?
Step 1: What Would You Do?
There is often more than one good answer. Pick one and see what happens.
Step 2: What That Was
The name for what you just worked out.
When you pick one thing, you are also saying no to the other. That is what choosing is.
Look at both first
Hold both. Look at both prices. Then decide. Choosing fast is how you end up wishing you had the other one.
There is often no wrong pick
Two good things and money for one is not a trick question. Either answer is fine. Knowing what you gave up is the useful part.
Step 3: Try It
These ones do have right answers.
What Did You Give Up?
Match each choice with the thing that was given up.
Match what was bought with what was given up.
Tap a card on the left to start.
Step 4: Somewhere Else
Same thinking. Different situation.
Saturday afternoon
You have one free afternoon. You could go to the park, or stay in and finish your model, or go to a friend’s house.
This is not about money at all. Does the same thinking work?
Step 5: Quick Check
Two questions, then you are done.
Question 1 of 1
You had money for one thing and you chose the puzzle. What did you give up?
Step 6: Your Life Mission
Something to do away from the screen. Nobody is checking.
Say it out loud
- Next time you choose between two things, say what you are giving up before you pick.
- Then pick anyway.
Why: Saying it out loud is what turns a habit into a decision.
Step 7: What You Learned
- Picking one thing means not picking the other.
- Look at both before you decide.
- Often neither answer is wrong.
For the grown-up
This is opportunity cost, which is the single most useful idea in personal finance and is perfectly learnable at five as long as nobody uses the phrase.
Watch for regret being treated as a mistake. A child who wishes they had picked the other thing has understood the lesson exactly — that feeling is the cost, and noticing it is the skill.
The strongest version of this at home is to make the trade explicit before the shop, not after: "there is money for one of them, have a think on the way".