Practice

Thirteen practice sets that explain every answer.

A live graph you can manipulate and five exam-style questions per topic, across micro and macro — each answer explained rather than just marked. No account needed.

Supply and demandMicroMove the demand and supply curves, watch equilibrium update, and test yourself on shifts vs. movements and simultaneous changes.Start practicingPrice ceilings and price floorsMicroSet a binding ceiling or floor, see the shortage or surplus appear, and answer five classic exam questions on price controls.Start practicingMonopoly profit maximizationMicroDrag demand and cost on an interactive monopoly graph. MR = MC, the monopoly markup, and the welfare triangle — with five exam-style questions.Start practicingElasticity and the total revenue testMicroWatch total revenue climb, peak, and fall along a linear demand curve. Five questions on elastic vs. inelastic regions and the unit-elasticity midpoint.Start practicingExternalities and corrective taxesMicroWatch a market overproduce when costs spill onto bystanders, apply a corrective tax, and see the deadweight loss vanish. Five questions on market failure.Start practicingPerfect competitionMicroA price-taking firm picks output where marginal cost meets the market price. Five questions on MC = MR, the shutdown rule, and long-run zero profit.Start practicingComparative advantage and tradeMicroCompare two producers' opportunity costs and find who should specialize in what. Five questions on absolute vs. comparative advantage and terms of trade.Start practicingAggregate demand and supplyMacroOpen a recessionary or inflationary gap, step time forward, and watch the economy self-correct. Five questions on shifts, supply shocks, and the vertical LRAS.Start practicingGDP and national incomeMacroBuild GDP from C + I + G + NX, then test yourself on what counts, the final-vs-intermediate trap, and nominal vs. real GDP.Start practicingInflation and CPIMacroReprice a fixed basket to see inflation appear, then answer five questions on the CPI, who wins and loses, substitution bias, and real wages.Start practicingFiscal policy and multipliersMacroSlide the MPC and watch one dollar of spending ripple out to GDP. Five questions on multipliers, crowding out, and automatic stabilizers.Start practicingMonetary policyMacroShift the money supply in the money market and watch the interest rate move. Five questions on open market operations and the liquidity trap.Start practicingUnemploymentMacroSort workers into employed, unemployed, and out of the labor force. Five questions on frictional vs. structural vs. cyclical and the discouraged-worker trap.Start practicing

Also free

Seven calculators, same idea.

Each one plots what it computes, so the number and the picture arrive together — elasticity, surplus, deadweight loss, GDP, inflation, and the multipliers.

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