Tools
Seven calculators that show their working.
Each one plots what it computes, so the number and the picture arrive together. No account, no limit on how many times you run them.
Price elasticity of demandMicroCalculate price elasticity using the midpoint (arc) method or point method. Includes elasticity classification and revenue impact.Open calculatorConsumer & producer surplusMicroCompute consumer surplus, producer surplus, and total economic surplus at market equilibrium from linear demand and supply.Open calculatorDeadweight lossMicroCalculate deadweight loss from price ceilings, price floors, taxes, or monopoly pricing. Shows the welfare triangle size and the surplus transferred.Open calculatorGDPMacroCompute GDP from the expenditure approach (C + I + G + NX) and convert nominal GDP to real GDP using the deflator.Open calculatorInflation rate & CPIMacroFind the inflation rate between two CPI readings and adjust a dollar amount from one year's prices to another's.Open calculatorSpending multiplierMacroTurn the MPC into the spending, tax, and balanced-budget multipliers, and see how a change in spending ripples out to GDP.Open calculatorMoney multiplierMacroUse the reserve ratio to get the money multiplier and the maximum money a new deposit can create across the banking system.Open calculator
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Nine practice sets, same idea.
A live graph and five exam-style questions per topic, each answer explained rather than just marked.
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