Elasticity Rules & Revenue Effect
Midpoint %Δ Price = (P2 − P1) ÷ ((P1 + P2) ÷ 2) × 100
Midpoint %Δ Quantity = (Q2 − Q1) ÷ ((Q1 + Q2) ÷ 2) × 100
|Ed| = | %Δ Quantity ÷ %Δ Price |
- Inelastic (|Ed| < 1.0): Price increases raise total revenue because volume drops proportionately less than price rises.
- Elastic (|Ed| > 1.0): Price increases reduce total revenue because customer drop-off outweighs the higher price per unit.
- Unitary (|Ed| = 1.0): Total revenue remains unchanged.