Economics Calculators
Price Elasticity of Demand (PED)
PED = %ΔQd ÷ %ΔP
Price Elasticity of Supply (PES)
PES = %ΔQs ÷ %ΔP
Income Elasticity of Demand (YED)
YED = %ΔQd ÷ %ΔY
Cross Elasticity of Demand (XED)
XED = %ΔQa ÷ %ΔPb
The Multiplier
k = 1 ÷ (1 − MPC); ΔY = k × injection
Marginal Propensity to Consume (MPC)
MPC = ΔC ÷ ΔY
Percentage Change
% change = ((New − Old) ÷ Old) × 100
Index Number
Index = (Current ÷ Base) × 100