Price Elasticity
Price elasticity measures how sensitive consumer demand is to changes in price. In apparel, understanding elasticity by category, brand tier, and season determines optimal markdown depth and promotional strategy.
What is price elasticity?
Price elasticity (formally, price elasticity of demand) measures the percentage change in quantity demanded resulting from a percentage change in price. In apparel merchandising, price elasticity quantifies how consumers respond to price changes — whether a 20% markdown on a knit top will generate a proportional, greater-than-proportional, or less-than-proportional increase in units sold. This metric is the quantitative foundation for markdown strategy, promotional planning, and initial price-point selection.
A product with high elasticity (elastic demand) sees significant volume increases when prices drop — markdowns on these items generate substantial incremental revenue. A product with low elasticity (inelastic demand) sees minimal volume change regardless of price — discounting these items surrenders margin without meaningfully accelerating sell-through.
Why price elasticity matters in apparel
Every markdown dollar a brand spends is an investment. Price elasticity determines the return on that investment. Without elasticity data, markdown decisions are based on instinct — and instinct consistently leads to two costly errors:
- Over-discounting inelastic categories: Marking down a premium cashmere sweater by 40% rarely generates enough incremental volume to offset the margin sacrifice. Customers who want cashmere at $89 were never going to pay $298; customers willing to pay $298 would have bought at $248.
- Under-discounting elastic categories: A 15% markdown on a moderately elastic denim program might move 10% more units. A 25% markdown might move 35% more units. The additional 10 points of discount generate disproportionate volume — but only if the team knows the elasticity curve.
Price elasticity in apparel varies dramatically by:
- Category: Basics and commoditized categories (tees, socks) tend to be more elastic. Premium and differentiated categories (outerwear, tailored clothing) tend to be less elastic.
- Brand positioning: Luxury brands often exhibit low elasticity — deep discounts damage brand equity without proportionally increasing demand.
- Season timing: Elasticity increases as the season progresses — a customer unresponsive to 20% off in October may respond to 20% off in December when holiday gifting creates urgency.
Price elasticity in practice: apparel example
A women's contemporary brand analyzes price elasticity across its three largest categories to optimize its end-of-season markdown strategy:
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Knit tops (elasticity: -2.1): Highly elastic. A 10% price reduction drives a 21% increase in units sold. The team sets a first markdown of 25% off at week 9, projecting a 52% increase in weekly unit velocity — enough to clear 80% of remaining inventory before a deeper second markdown is needed.
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Denim (elasticity: -0.8): Inelastic. A 10% price reduction drives only an 8% increase in units sold. The team holds denim at full price through week 11 and takes a single 30% markdown in week 12, accepting that denim will carry into the off-price channel rather than destroying margin with ineffective early markdowns.
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Dresses (elasticity: -1.4): Moderately elastic. The team implements a stepped markdown: 20% off in week 9, 30% off in week 11, 40% off in week 13. The stepped approach generates more total revenue than a single deep markdown, as early buyers capture higher-elasticity demand at shallower discounts.
Common mistakes
- Assuming elasticity is constant — elasticity changes with season timing, inventory levels, competitive context, and even weather patterns
- Calculating elasticity from promotional events only — promotional elasticity (response to temporary price reductions) differs from permanent elasticity; mixing the two produces misleading estimates
- Applying category-level elasticity to individual styles — within the denim category, a fashion-forward wide-leg may have very different elasticity than a classic straight-leg
- Ignoring cross-elasticity between categories — a deep markdown on knit tops may cannibalize demand from woven tops at full price, offsetting the margin benefit of the knit markdown
In RetailNorthstar: Historical sell-through data at varying price points is analyzed to surface category-level elasticity patterns, helping merchandising teams set markdown depths that maximize revenue recovery without unnecessary margin sacrifice.