What it means
Every business in a price war faces the same midnight question: is staying open tomorrow cheaper than closing tonight. The shutdown point is the price at which the answer flips.
The logic turns on fixed costs: rent, debt, and salaried staff are paid whether the factory runs or not, so the only question that matters is whether revenue covers the variable costs of making the next unit. The OpenStax economics textbook states the rule plainly: if price falls below minimum average variable cost, the firm shuts down, because producing anything adds losses beyond the fixed costs already sunk.
Above the shutdown point, a loss-making firm keeps producing: it covers its variable costs and contributes something to the fixed ones, which beats contributing nothing. Below it, every unit sold deepens the hole: the firm loses the variable cost on each sale plus the fixed costs anyway, and the warehouse of losses grows with the output.
The distinction explains strange sights: hotels open in dead seasons at ruinous rates, mines running at a loss, and airlines flying half-empty, all rational because variable costs are covered and the fixed meter runs regardless. The long run dissolves the mercy: at the next lease renewal, machine replacement, or loan refinancing, the fixed costs become choices, and a firm that cannot cover total costs exits for good.
For a non-finance reader, the shutdown point separates a bad year from a terminal one: endure prices that cover your running costs, and close the day they do not. The concept generalises beyond factories: a freelancer deciding whether a gig covers its transport and tools, or a shop deciding whether Sunday opening pays its staff, is running the same variable-cost test.
Accounting records the decision awkwardly: shutdown losses appear as continuing fixed costs against zero revenue, so a mothballed plant can look worse monthly than a struggling one even as it loses less.
In practice
Real-world examples.
Example
A dairy stops milking when the price falls below feed and labour costs per litre, capping the daily loss at the fixed costs. With feed, vet bills and casual labour at $0.60 a litre, any price below that makes each litre deepen the loss. The farm keeps paying the barn mortgage but stops adding to the damage.
Example
A hotel runs at ruinous off-season rates because room revenue covers housekeeping and contributes to the mortgage. A $40 room that costs $25 to clean and service still brings in $15 towards fixed costs. An empty room would bring in nothing.
Example
Restarting after a shutdown means rebuying capacity at recovered prices, the exit that becomes permanent. A mine that sells its trucks and releases its crews cannot simply switch back on when prices recover. The pause that saved the business in the trough can leave it unable to compete in the recovery.
Formula
Calculation
Shut down when price is below minimum average variable cost; produce (at a loss) when price is between average variable and average total cost; the shutdown point is the minimum of the average variable cost curve.
Worked example with fictional figures. A dairy produces 1,000 litres a day with variable costs of $600 (feed, vet bills and casual labour), so average variable cost is $0.60 a litre. Fixed costs are $300 a day (mortgage and leases), so average total cost is ($600 + $300) / 1,000 = $0.90 a litre.
At a price of $0.50, producing earns $500 against $600 of variable cost, a loss of $100 before fixed costs and $400 after them. Closing loses only the $300 of fixed costs, so the dairy loses $100 a day less by shutting. At $0.70, producing earns $700, covers the $600 variable cost with $100 left towards fixed costs, and loses $200 after fixed costs, which beats the $300 loss from closing, so the dairy keeps milking. At $0.90 the dairy breaks even.Case study
Seen in the real world.
This case study is fictional and illustrative. A made-up family dairy faces a milk price collapse that drops the farm-gate price below the cost of feed, vet bills, and casual labour, the variable costs of each litre. The grandmother who founded the farm wants to keep the herd milked through the trough; the grandson's spreadsheet says the textbook answer. The numbers are the shutdown lesson exactly: at the current price, each litre loses money against variable costs, so every morning's milking buys a larger loss than the last, and the fixed costs, the barn mortgage and the equipment leases, accrue either way.
They sell the herd at the autumn auction, keeping the barn and the leases and their grief, and the farm's accounts stop bleeding that month. Two winters later the price recovers past total cost, and the decision they review is the long-run one the textbook warns about: restarting means buying cows at boom prices, and the shutdown that saved them has become the exit they cannot cheaply reverse. The grandson's farm-management course now teaches his own family as the case study: the shutdown point tells you when to stop, and nothing tells you the stopping may be forever.
Watch out
Common mistakes.
- Shutting when price merely sits below total cost; between variable and total cost, producing still beats closing because it contributes to fixed costs.
- Treating fixed costs as relevant to the daily decision; they are sunk for now, and only variable costs decide whether tomorrow's production pays.
- Assuming the shutdown is reversible; idle capacity, sold herds, and lost crews often make the pause permanent in practice.
Questions
People also ask.
What is the shutdown point?
The price equal to minimum average variable cost, below which a firm minimises losses by producing nothing.
Why produce at a loss above it?
Because revenue covers variable costs and contributes to fixed costs, which must be paid regardless, so producing loses less than closing.
What changes in the long run?
All costs become avoidable at renewal or replacement, so a firm that cannot cover total costs exits the industry entirely.
From the founder's library
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