Swap-ins and go-togethers — Price Square · Demand & Supply
Detective Pip notices something strange: when one price changes, other prices and sales change too. The secret is how things are linked.
Your task
Sort each pair: swap-ins or go-togethers?
- Swap-ins (substitutes) can replace each other: if one gets dearer, people buy more of the other. Go-togethers (complements) are used as a pair: if one gets dearer, people buy less of both.
- Invented stories to learn from. Prices and shops in them are made up, and this is not financial advice. Ask a trusted adult before buying or selling anything for real.
- Never share personal or payment details online. Nothing about you is collected.
Score
- Understanding trade — You understood how this part of trade works.
- Wise choices — You weighed your options before choosing.
- Fair play — You treated buyers and sellers fairly.
In real life
Economists call these substitutes and complements. Shops watch them closely, because a price change on one item can move sales of another.
Price Square
Invented stories to learn from, not financial advice. Before buying or selling anything for real, ask a trusted adult. Nothing about you is collected; progress stays on this device.
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