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Elasticity measures a response to a defined price change. It becomes an investment insight only after the customers, alternatives, time horizon, and other changes are identified.
Elasticity is a measurement with boundaries
Price elasticity of demand is the percentage change in quantity demanded divided by the percentage change in price, usually reported as a negative number. A magnitude greater than one is commonly called elastic: quantity changes proportionally more than price. A magnitude below one is inelastic. The USDA’s elasticity glossary uses this percentage-response definition, but the definition does not choose the product, customer group, time period, or alternative against which the response is measured.
A ten-percent price increase followed by a two-percent fall in units is evidence of a relatively inelastic response in that observed setting. It is not proof that customers love the product, that the next increase will have the same effect, or that the company possesses a durable moat. Customers may be locked into a contract, have not yet found a substitute, or be passing the cost through to someone else. Long-run demand can be more elastic than short-run demand because people have time to change suppliers, equipment, habits, or budgets.
The price response belongs to a customer and a substitute set
Elasticity is not a fixed property of a product in isolation. A hospital may be insensitive to a small price change for a sterile component when qualification and failure costs are high, while a distributor comparing interchangeable grades may switch suppliers immediately. A household may accept a price increase for a daily staple but cut the purchase during a recession. A software customer may tolerate a renewal increase while a contract is embedded, then switch at renewal when migration work becomes affordable.
Relevant alternatives include a competitor’s product, a lower grade, postponing the purchase, repairing an existing asset, producing internally, or going without. The price of the focal product can also change relative to complementary goods. A buyer’s response therefore depends on cross-price effects, switching cost, budget share, urgency, reliability, and whether the buyer pays the bill or merely chooses the supplier.
A documented comparison shows why context matters
Goolsbee and Chevalier’s NBER study of online book retailing estimated demand responses at Amazon and Barnes & Noble using price and sales data. It reported significant price sensitivity at both merchants but greater price elasticity at Barnes & Noble in its study period. The finding is useful because it compares sellers in a particular market rather than treating “online books” as having one universal elasticity. It does not establish that the difference still holds, that Amazon has permanent pricing power, or that the estimates apply to another product or era.
A second NBER study of tuna purchases during Lent found that changes in product mix and substitution explained much of the movement in average prices. That study is a reminder that an observed average price can move because customers choose different products, not because each product’s own demand curve shifted in the same way. Mix, stockouts, promotions, and customer composition must be separated before a company’s pricing response is interpreted.
What a pricing test can and cannot show
A controlled price experiment can compare treated and untreated customers, but even then the result is local. It may reveal how a segment responds to a particular price, plan, feature, or billing cadence. A company-wide increase is harder to interpret because management usually changes price when demand, costs, competition, or product quality are already changing. The observed volume loss may therefore combine the price effect with the reason the price was changed.
Revenue can rise when demand is inelastic, but profit depends on contribution margin, retention, servicing cost, refunds, and future competitive response. An increase that customers absorb today can encourage competitors to enter, buyers to redesign a process, or procurement teams to renegotiate. Conversely, a volume decline can be rational if the company leaves low-margin customers and preserves capacity for more profitable work. Elasticity is a demand observation, not a complete pricing decision.
Why the same company can see several elasticities
- Segment elasticity. Large accounts, small accounts, new customers, and renewing customers may face different alternatives and contract terms.
- Channel elasticity. A direct customer, a distributor, and a platform buyer may see different prices, information, and switching costs.
- Product elasticity. A core product, premium tier, spare part, and bundled service can have different substitutes and urgency.
- Time elasticity. The response at checkout, at contract renewal, and after a rival has qualified can differ materially.
- State-dependent elasticity. Recession, shortage, capacity surplus, regulation, and income changes can alter the response without changing the product’s physical function.
What investors should test
- Define the unit: bookings, subscribers, tonnes, customers, usage, or revenue. Check whether price is net of discounts, bundles, refunds, and commissions.
- Compare the price change with units, mix, retention, usage, contribution margin, and capacity. A revenue increase can conceal a customer or product mix change.
- Identify the realistic alternatives and the time needed to use them. “No competitor today” is not the same as high long-run switching cost.
- Separate a measured experiment from a before-and-after comparison. Ask what else changed and whether a control group or natural experiment exists.
- Track elasticity by customer and product cohort. An average can conceal that the most valuable customers are becoming more price-sensitive.
- Look for delayed response: renewals, procurement cycles, redesigns, and competitor entry. These often reveal more than the first month after a price increase.
Pricing elasticity is most useful as a disciplined question: under which conditions can the company raise price without losing the activity it needs? The answer may support a competitive advantage, but it may also reflect temporary contracts, hidden subsidies, lack of alternatives, or a buyer who has not yet had time to respond.