LET’S TRY ONE
In one hour, Ari makes 8 cards or 4 bookmarks. How many cards does Ari give up by using that hour for bookmarks?
8 cards
The hour used for bookmarks cannot also produce the available 8 cards.
Learning steps & teaching tips
Use a supplied production table to compare feasible choices and gains from a stated exchange.
- List what each person can produce in the same time.
- Calculate the output under each stated plan.
- Compare each person's before-and-after bundle to evaluate the proposed exchange.
Try it together
Create a two-person production table with paper models. Compare making a little of each item with specializing and exchanging a stated quantity.
Keep time and quantities consistent, and evaluate the particular trade described rather than assuming every trade benefits everyone.