ElasticityMargin Studio — Free Interactive In-Browser Studio
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Quick Reference & Frequently Asked Questions
How is midpoint arc price elasticity of demand (PED) calculated?
Midpoint arc elasticity divides the percentage change in quantity demanded by the percentage change in price using the average of the starting and ending values as the base: ((Q2 - Q1) / ((Q1 + Q2) / 2)) divided by ((P2 - P1) / ((P1 + P2) / 2)). This eliminates directional bias whether you test a price increase or a discount.
Why did my net profit drop even though my 20% off promo increased unit sales by 50%?
Because a discount comes directly out of your unit contribution margin. If your baseline gross margin is 40%, a 20% price cut slices your dollar profit per unit in half—meaning you must double unit sales (+100% volume lift) just to earn the same total profit dollars.
How do I know if I should raise prices instead of discounting?
When a SKU has inelastic demand (|PED| < 1.0) or when its elasticity magnitude is smaller than the reciprocal of your contribution margin ratio, a 10% to 15% price increase loses fewer unit sales than the extra margin gained per unit, resulting in higher net profit.
How does chained B2B trade discount math (such as 20/10/5) work?
Chained trade discounts are applied sequentially to the remaining balance, not added together. A 20/10/5 chain equals 1 - (0.80 * 0.90 * 0.95) = 31.6% net equivalent discount, not 35%. Our calculator computes the exact net invoice price and margin floor.