What it means
Exchanges set daily price limits on many futures contracts, based on the previous day's settlement price. If a contract falls to its lower limit, it is said to be limit down.
The purpose is to give traders time to assess news, find cash for margin calls and avoid disorderly markets. The limit does not change the contract's underlying value; it only controls how fast the price can adjust.
When the market is locked at limit down, sellers find few buyers, and orders may be unfilled. Traders who want to exit may have to wait until the next session, when the limit may be reset or expanded.
Limit down creates real risk for investors holding long positions, because they cannot sell at any price below the floor. Margin requirements may rise, and traders can face further losses the next day if the price continues to fall.
Many exchanges also use circuit breakers (temporary pauses in trading) on share indices and individual shares, which are sometimes described with the same phrase. The exact limits differ by product and exchange, and they are revised from time to time.
The pattern is common in agricultural and energy contracts when major news arrives, such as a weather report. Understanding the limit helps risk managers plan for the worst realistic one-day loss.
In practice
Real-world examples.
Example
A corn farmer who sold futures to hedge her harvest watches the market fall to limit down after a favourable weather report. Her futures gain value, but she cannot lock in the profit by buying back contracts until trading resumes. She waits for the next session. In effect the exchange rule slows her ability to realise the gain, even though her position is profitable.
Example
A speculator holds five long wheat contracts when the price drops to limit down on surprise news. He cannot sell, and his broker issues a margin call. He wires $8,000 to keep the position open. He learns that a limit-down close does not end his risk, because the next session may open lower still.
Example
A risk officer at a trading firm models a limit-down scenario for an energy portfolio. She calculates that three consecutive limit-down days would cost $450,000. The firm holds extra cash to cover that outcome. She presents the number to the board as part of the firm's regular liquidity stress tests.
Formula
Calculation
Lower price limit = Previous settlement price - Daily price limit
Loss per contract at limit down = Daily price limit x Contract size
Suppose a grain contract settled yesterday at $4.00 per bushel and the daily limit is $0.30. The lower limit is 4.00 - 0.30 = $3.70. With a contract size of 5,000 bushels, the loss per contract at limit down is 0.30 x 5,000 = $1,500. A trader holding 10 long contracts therefore has a one-day loss of 10 x 1,500 = $15,000. The numbers show why the limit matters for liquidity planning. A trader who can lose $15,000 in a day on 10 contracts, with no ability to sell, needs enough cash to meet margin calls even when the position cannot be closed.Case study
Seen in the real world.
Redstone Commodities is an illustrative, fictional trading firm that holds 40 long grain futures contracts. A surprise report sends the market limit down at $0.30, and its traders cannot exit. The loss that day is 40 x 1,500 = $60,000.
The next day the exchange widens the limit, and prices fall a further $0.20 before steadying, costing another 40 x 0.20 x 5,000 = $40,000. The firm survives because it held cash for margin calls. The numbers are invented, but they show why liquidity planning matters.
Afterwards Redstone's risk committee changed its rules so that no single commodity position could exceed an amount that would cause a loss of more than 2% of capital over three consecutive limit-down days. The committee also kept a standing credit line to cover margin calls.
Watch out
Common mistakes.
- Assuming a stop order will always protect you. If the market is locked limit down, the order may not execute. A stop order only becomes a market order after the price is touched, and it can sit unfilled for the whole session.
- Believing the limit prevents losses. It only spreads them over several sessions. Three limit-down days in a row can produce a loss three times as large.
- Ignoring margin calls on limit-down days. Brokers may demand extra funds even when you cannot trade.
Questions
People also ask.
What happens when a market is limit down?
Trading may stop or continue only at the floor price, and many orders go unfilled. Some exchanges pause trading for a short time and then reopen with the same or wider limits.
Is the limit the same for every contract?
No, each exchange sets limits by product and may change them. Traders can find the current limit in the contract specifications published by the exchange.
How is it different from a limit order?
A limit order is an instruction from a trader, whereas limit down is a rule set by the exchange.
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