Interactive teaching tools
Built for IB and Cambridge economics, free to use. Drag the curves — the numbers respond with the real economics underneath.
SL & HL
PPF & opportunity cost
Drag a production point inside, onto and past the frontier — scarcity, efficiency and trade-offs, live.
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SL & HL
Price elasticity of demand
Drag along a demand curve to see |PED| change — and what it does to total revenue.
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SL & HL
Market equilibrium
Shift supply and demand, move the market price, and watch surpluses and shortages pull it back.
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HL
Tax incidence
Apply a per-unit tax and see how elasticity — not the law — decides who really pays it.
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HL
The multiplier
Drop one injection into the economy and watch it ripple through diminishing rounds toward k × the injection.
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SL & HL
Elasticity calculator
Type the before-and-after values and get PED, YED or XED with a plain-English interpretation.
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Sample set
Self-check quiz
Five quick checks on the foundations — instant feedback with one-line explanations.
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