Concept Architecture
Concept
Theoretically, Elastic Demand describes a situation in which the quantity demanded of a good or service changes proportionately more than the change in its price. It is a fundamental concept in consumer demand theory and reflects a high degree of responsiveness of consumers to price changes. In health economics, elastic demand is commonly observed for discretionary healthcare services, elective procedures, and products with readily available substitutes.
Mathematically, elastic demand is defined by the own-price elasticity of demand exceeding one in absolute value. The elasticity coefficient measures the percentage change in quantity demanded resulting from a one per cent change in price. Elastic demand is represented by a relatively flat demand curve, indicating substantial changes in utilisation following price changes.
In practice, elastic demand is estimated using healthcare utilisation, claims, prescribing, or survey data through econometric demand models. Estimates of price elasticity are used to predict the effects of user charges, copayments, pharmaceutical pricing, reimbursement policies, and taxation on healthcare consumption and expenditure.
Purpose
Used to quantify highly price-responsive demand for healthcare goods and services, supporting pricing decisions, reimbursement policy, demand forecasting, and economic evaluation.
Mathematical Formulae
Primary Formula
E? = |(%?Q?)?(%?P)|
Elastic demand occurs when:
E? > 1
where:
- E? = own-price elasticity of demand
- %?Q? = percentage change in quantity demanded
- %?P = percentage change in price
Supporting Formulae
Arc price elasticity:
E? = |[(Q? ? Q?)?((Q? + Q?)?2)] � [(P? ? P?)?((P? + P?)?2)]|
Related Mathematical Methods
- Price elasticity estimation
- Demand modelling
- Econometric regression
- Consumer demand analysis
- Demand forecasting
Example
The price of an over-the-counter health product increases from �20 to �22, a 10% increase. Demand falls from 1,000 units to 850 units, a 15% decrease.
E? = |-15%?10%| = 1.5
Since the elasticity exceeds one, demand is elastic.
Excel Implementation
| Function | Example Formula | Health Economics Application |
|---|---|---|
=((New-Old)/Old) | =(C2-B2)/B2 | Calculates the percentage change in quantity demanded. |
=((New-Old)/Old) | =(E2-D2)/D2 | Calculates the percentage change in price. |
| ABS | =ABS(((C2-B2)/B2)/((E2-D2)/D2)) | Calculates the absolute value of own-price elasticity. |
| LINEST | =LINEST(LnQuantity,LnPrice,TRUE,TRUE) | Estimates price elasticity from observed healthcare demand data. |
VBA (Optional)
Automate estimation of own-price elasticities for multiple healthcare products and classify demand as elastic, unit elastic, or inelastic.
Sources
- Varian HR. Intermediate Microeconomics: A Modern Approach.
- Pindyck RS, Rubinfeld DL. Microeconomics.
- Folland S, Goodman AC, Stano M. The Economics of Health and Health Care.
- Zweifel P, Breyer F, Kifmann M. Health Economics.
- Drummond MF, et al. Methods for the Economic Evaluation of Health Care Programmes. Oxford University Press.
Related Concepts (2)
Library
Publications
1
Uncertainty and the Welfare Economics of Medical Care — Kenneth J. Arrow, Vol. 53, No. 5 ed., 1963 (American Economic Review)
The founding paper of health economics as a discipline, analysing how uncertainty, asymmetric information, trust and the special features of medical markets prevent them from behaving like ordinary competitive markets — the intellectual origin of the entire field.
Journal ArticleView source →
Frequently Asked Questions (6)
What is elastic demand?
A condition in which quantity demanded changes proportionally more than a given price change, indicating consumers are relatively sensitive to price.
Source: Varian 2014
What is an example of elastic demand in health?
Demand tends to be elastic where close substitutes exist or the purchase is easily postponed, so a price rise pushes buyers toward alternatives or away from the purchase altogether. In health, elective and discretionary services show this pattern more than urgent care, since cosmetic procedures and over-the-counter remedies with rival brands respond noticeably to price. The availability of an alternative is what gives buyers the option to cut back. Gravelle and Rees (2004) relate elasticity to the availability of substitutes.
Source: Gravelle & Rees 2004
What makes demand elastic?
Demand tends to be elastic when close substitutes are available, so buyers can switch easily when a price rises; when the good is a large share of the budget, so a price change matters greatly; when the good is a luxury rather than a necessity; and when buyers have time to adjust. Each of these lets buyers respond strongly to price, producing a proportionally large change in quantity demanded and hence an elasticity greater than one.
Source: Varian 2014
How does elastic demand affect revenue?
When demand is elastic, a price rise reduces the quantity sold proportionally more than the price increases, so total revenue falls, while a price cut raises quantity enough to increase revenue. Revenue therefore moves in the opposite direction to price under elastic demand. This matters for pricing decisions, since a seller facing elastic demand can raise revenue by lowering price, whereas raising price loses more in sales than it gains per unit.
Source: Varian 2014
How does elastic demand relate to health care?
Much health care demand is relatively inelastic, since care is often a necessity with few substitutes and is partly shielded by insurance, but some elements are more elastic. Discretionary services, choices among competing providers or products, and care with close alternatives can show elastic demand, so buyers respond noticeably to price differences. Recognising where health care demand is elastic helps predict how patients respond to co-payments or price differences, though insurance and limited information moderate the response.
Source: Varian 2014
How is elasticity of demand measured?
Elasticity of demand is measured as the percentage change in quantity demanded divided by the percentage change in price. Demand is elastic when this ratio exceeds one in absolute value, meaning quantity responds proportionally more than price. Because the percentages are used, elasticity is independent of the units of measurement, allowing comparison across goods. It is usually estimated over a particular range of prices, so the same good may be more elastic at some prices than others.
Source: Varian 2014
Trust Record
Verified by Dr Darrin Baines
British health economist
Professional identity: darrinbaines.org
Verification date: 10 Sep 2025
Content version: 1.0.0
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- Persistent URI
- https://healtheconomics.wiki/concept/elastic-demand
- Term code
- HE-EE-ME-019
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