What it means
In a market at equilibrium, the price sits where the demand curve and the supply curve cross, and there is no pressure for it to change. In disequilibrium the price sits somewhere else, so one side of the market cannot get what it wants.
Too low a price creates a shortage; too high a price creates a glut. This is not an abstraction for business planning.
Shortages show up as long lead times, allocation, grey markets and customers who will pay above list, while gluts show up as discounting, rising inventory and cancelled orders. Economists split the causes into two groups.
Something has shifted, such as a new technology, a tariff or a change in taste, and the market has not yet adjusted; or something is preventing adjustment, such as a price cap, a minimum wage, a fixed exchange rate or a long-term contract. The practical test is direction rather than level.
If your order book is growing faster than you can fill it and competitors are quoting the same delays, you are in a shortage and price rises are coming; if inventory days keep climbing across the whole sector, the correction will come through price cuts. The important nuance is that disequilibrium can persist for years when the blocking force is structural.
Housing markets, regulated utilities and pegged currencies can all sit away from their clearing price for a long time, which is why the eventual adjustment tends to arrive suddenly rather than gently.
In practice
Real-world examples.
Example
A chip shortage leaves a vehicle assembler able to build only 60% of its scheduled units while dealers hold waiting lists. The disequilibrium clears over two years as new fabrication capacity comes online and prices fall back.
Example
A city introduces rent controls well below the market clearing level. Tenants who already hold leases benefit, but new arrivals face a persistent shortage of listings and landlords quietly convert flats to short-stay use.
Example
A fashion retailer over-orders on a trend that fades, leaving 140,000 units in a warehouse. It reaches a new balance only after three rounds of markdowns take the average selling price from $45 to $19.
Formula
Calculation
Excess demand = quantity demanded (Qd) - quantity supplied (Qs) at the current price. A positive result is a shortage; a negative result is a surplus.
Take a market for a component with these schedules, where P is the price in dollars per unit:
Demand: Qd = 150,000 - 4,000P
Supply: Qs = 30,000 + 2,000P
Equilibrium is where the two are equal:
150,000 - 4,000P = 30,000 + 2,000P
120,000 = 6,000P
P = $20, and quantity = 150,000 - (4,000 x 20) = 70,000 units
Check on the supply side: 30,000 + (2,000 x 20) = 70,000 units
Now suppose a regulator caps the price at $15:
Qd = 150,000 - (4,000 x 15) = 90,000 units
Qs = 30,000 + (2,000 x 15) = 60,000 units
Excess demand = 90,000 - 60,000 = 30,000 units
Thirty thousand units of demand go unfilled every period until either the cap is lifted or supply expands.Case study
Seen in the real world.
Verity Bikes is an illustrative, invented company used to show how disequilibrium feels from inside a business. When commuting patterns shifted, orders for its folding model jumped from 900 a month to 2,600 while the factory could produce 1,200, leaving unmet demand of 1,400 units a month.
Management first read the queue as loyalty and kept the price at $780 while the backlog grew to eleven months. Resellers began listing the bikes at $1,150, which told the founders that the market price was well above their list price and that the extra margin was being captured by someone else.
Verity raised the price to $960, added a second assembly shift and watched orders settle at roughly 1,500 a month against capacity of 1,450. The gap closed not because demand collapsed but because price and supply both moved towards each other, which is what leaving disequilibrium normally looks like.
Watch out
Common mistakes.
- Treating a shortage as proof of a permanent competitive advantage rather than a temporary imbalance that new supply will erode.
- Assuming markets always return to equilibrium quickly, when caps, contracts and regulation can hold an imbalance in place for years.
- Reading rising prices alone as disequilibrium, when a higher price can simply be the new equilibrium after costs have risen.
Questions
People also ask.
What is the difference between disequilibrium and volatility?
Volatility is how much a price moves around, whereas disequilibrium is a state in which the quantity demanded and the quantity supplied do not match at the current price.
Can a whole economy be in disequilibrium?
Yes, persistent unemployment, a fixed exchange rate defended against market pressure or sustained inflation are all treated as economy-wide imbalances.
Does disequilibrium always mean someone is worse off?
Not necessarily, since the side of the market that can transact at the artificial price often gains, but the total quantity traded is smaller than it would otherwise be.
From the founder's library
Take it further with the book.
Build your financial confidence beyond this definition. Shihan's full-length guide, Accounting Fundamentals, takes the same plain-English approach and turns it into a complete, practical playbook for non-finance managers, business owners and students - with chapter-end quiz answers and presentation slides included.
25% off with code MMHQ25, applied at checkout. Priced in USD - checkout may show the equivalent in your local currency.
View the book and save 25%Related