Price Elasticity of Demand (PED)
How responsive quantity demanded is to a change in price.
Formula
PED = %ΔQd ÷ %ΔP Interpretation
|PED| > 1 elastic | |PED| < 1 inelastic | |PED| = 1 unit elastic PED is negative due to the law of demand — examiners accept the negative sign or the absolute value.