Concept Architecture
Concept
Theoretically, Equilibrium Price is the market price at which the quantity demanded equals the quantity supplied, resulting in market equilibrium. It is a central concept in microeconomic theory and reflects the interaction of consumer preferences and producer behaviour. At the equilibrium price, there is neither excess demand nor excess supply, and market-clearing occurs. In health economics, equilibrium price is relevant in competitive healthcare markets, pharmaceutical markets, labour markets, and analyses of regulated versus market-based pricing.
Mathematically, equilibrium price is determined by simultaneously solving the demand and supply functions. The equilibrium occurs where the demand curve intersects the supply curve, yielding both the equilibrium price and equilibrium quantity. Comparative statics are then used to evaluate how shifts in demand or supply affect market equilibrium.
In practice, equilibrium prices are estimated using market data, econometric models, or simulation models. Although many healthcare prices are administratively regulated rather than market-determined, the concept remains fundamental for analysing competitive healthcare markets, pharmaceutical competition, insurance markets, and policy interventions affecting prices and utilisation.
Purpose
Used to determine the market-clearing price at which healthcare supply equals demand, supporting market analysis, pricing policy, and economic modelling.
Mathematical Formulae
Primary Formula
Market equilibrium occurs when:
Q? = Q?
If
Q? = a ? bP
and
Q? = c + dP
then the equilibrium price is:
P* = (a ? c)?(b + d)
Supporting Formulae
Equilibrium quantity:
Q* = a ? bP*
Related Mathematical Methods
- Simultaneous equation solving
- Supply and demand analysis
- Comparative statics
- Market equilibrium modelling
- Econometric estimation
Example
Suppose:
Q? = 1,000 ? 20P
Q? = 200 + 20P
Setting demand equal to supply:
1,000 ? 20P = 200 + 20P
800 = 40P
P* = 20
The equilibrium quantity is:
Q* = 1,000 ? 20(20) = 600
The market equilibrium is a price of �20 and a quantity of 600 healthcare services.
Excel Implementation
| Function | Example Formula | Health Economics Application |
|---|---|---|
=(a-c)/(b+d) | =(1000-200)/(20+20) | Calculates the equilibrium price from linear demand and supply functions. |
=a-(b*Price) | =1000-(20*B2) | Calculates the equilibrium quantity. |
| Goal Seek | Goal Seek | Determines the price where demand equals supply for non-linear models. |
| Solver | Solver | Solves complex market equilibrium models with multiple constraints. |
VBA (Optional)
Automate equilibrium calculations by solving demand and supply equations for multiple healthcare markets and generating comparative statics under alternative policy scenarios.
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
The Economics of Health and Health Care — Folland, Goodman, Stano & Danagoulian, 9th Edition ed., 2024 (Routledge)
The market-leading general health economics textbook, giving comprehensive coverage of health economics through core economic themes and balancing theory, empirical evidence and public policy. The ninth edition adds chapters on health disparities and pandemic economics.
BookView source →
Frequently Asked Questions (6)
What is the equilibrium price?
The price at which the quantity consumers wish to buy equals the quantity producers wish to sell, clearing the market.
Source: Varian 2014
How does the equilibrium price coordinate buyers and sellers?
At the equilibrium price the plans of buyers and sellers are consistent, since the amount people wish to buy exactly matches the amount firms wish to sell, so no one is left wanting to trade but unable to. The price acts as a signal, rising when buyers want more than is offered and falling when sellers offer more than is wanted, guiding both sides toward the level that reconciles them. No central direction is needed for this coordination. Gravelle and Rees (2004) explain this signalling role of price.
Source: Gravelle & Rees 2004
How is the equilibrium price determined?
The equilibrium price is determined by the interaction of demand and supply: it is the price at which the quantity demanded equals the quantity supplied, shown by the intersection of the demand and supply curves. At any higher price, supply exceeds demand and a surplus pushes the price down; at any lower price, demand exceeds supply and a shortage pushes it up. These pressures move the price toward the level where the two quantities are equal.
Source: Varian 2014
What happens when price is not at equilibrium?
When the price is above equilibrium, the quantity supplied exceeds the quantity demanded, producing a surplus; sellers unable to sell all their goods cut the price, moving it toward equilibrium. When the price is below equilibrium, demand exceeds supply, producing a shortage; buyers competing for scarce goods bid the price up. These adjustments continue until the price reaches the level where quantity demanded equals quantity supplied, so the market tends toward equilibrium.
Source: Varian 2014
How does the equilibrium price change?
The equilibrium price changes when demand or supply shifts. An increase in demand or a decrease in supply raises the equilibrium price, while a decrease in demand or an increase in supply lowers it. A shift in one curve moves the intersection to a new price and quantity. Because the equilibrium reflects both curves, its response to a change depends on which curve shifts and by how much, and often on the elasticities of demand and supply.
Source: Varian 2014
Why does the equilibrium-price concept apply imperfectly to health care?
The equilibrium-price concept applies imperfectly to health care because many of its markets do not clear through freely adjusting prices. Prices are often administered or negotiated rather than set by supply and demand, insurance separates patients from the price at the point of use, and information is unequal. As a result, health care prices may not settle at the level equating quantity demanded and supplied, so the simple equilibrium model describes health care markets only partially.
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
Canonical Identity
- Persistent URI
- https://healtheconomics.wiki/concept/equilibrium-price
- Term code
- HE-EE-ME-020
Stable URI · Machine-readable · Resolvable · CC BY 4.0