What it means
Exchanges set daily price limits on many futures contracts, based on the previous day's settlement price. If a contract rises to its upper limit, it is said to be limit up.
The rule is a form of circuit breaker. It gives buyers and sellers time to assess news, arrange cash for margin and avoid disorderly price jumps.
When a market is locked limit up, there are more buyers than sellers at the ceiling price, and many buy orders go unfilled. Traders holding short positions cannot buy back contracts, so they cannot stop their losses until the lock lifts.
The limit may be expanded after a limit move, so the next day's range is wider. The exact limits differ by product and exchange and are reviewed over time, so traders should check the current contract specifications.
Limit up days often follow shocks such as poor weather for crops, supply interruptions or unexpected policy announcements. Hedgers and speculators both need to plan for the possibility of consecutive limit-up days.
The pattern is also described in some share markets, where individual stocks have daily price bands. The same logic applies, but the rules are set by each exchange and market.
In practice
Real-world examples.
Example
A flour miller buys wheat futures to protect against price rises. A drought report sends prices limit up, and her hedge gains $2,250 per contract that day. The gain offsets the higher cost of physical wheat she must buy. The hedge protects her margins, though her cash costs rise at the same time.
Example
A speculator is short three coffee contracts when a frost warning pushes the market limit up. He cannot buy back at the capped price because no sellers are available. His broker issues a margin call for $12,000. He must either add cash or accept that his broker may liquidate the position once trading resumes.
Example
A commodity risk manager runs a stress test on a client's portfolio. He assumes two consecutive limit-up days and calculates the extra margin the client would need to post. The client keeps a cash buffer to cover it. He reports the figure to the client in writing so that the risk is documented.
Formula
Calculation
Upper price limit = Previous settlement price + Daily price limit
Loss per short contract = Daily price limit x Contract size
Suppose wheat settled at $6.00 per bushel yesterday and the daily limit is $0.45. The upper limit is 6.00 + 0.45 = $6.45. With a 5,000-bushel contract, a short seller loses 0.45 x 5,000 = $2,250 per contract on a limit-up day. A trader short 4 contracts therefore loses 4 x 2,250 = $9,000 that day and, if the market is locked, cannot exit until trading resumes. The result shows the cash exposure of a short position in a rising market. If the lock continued for a second day, the same trader would lose another $9,000, taking the total to 2 x 9,000 = $18,000 before being able to exit.Case study
Seen in the real world.
Brookfield Foods is an illustrative, fictional company that sells fixed-price cereal contracts to retailers while buying wheat on the open market. It sold 60 contracts of wheat futures short as a mistaken hedge, believing prices would fall.
A weather shock sends wheat limit up for two days at $0.45 each. The loss is 60 x 5,000 x 0.45 = $135,000 on day one, and another $135,000 on day two. Because the market was locked, the company could not exit. The story is invented, but it shows why hedges must be sized and directed carefully.
Brookfield's board afterwards required that hedges always match the direction of the underlying exposure, so a company that buys wheat would hold long futures and not short ones. It also set a margin reserve equal to three limit-up days on its largest position.
Watch out
Common mistakes.
- Assuming you can always buy back a short position. When the market is locked limit up, there may be no sellers. A locked market can last several sessions in a severe shortage.
- Ignoring margin on limit-up days. Losses are settled daily, and brokers can ask for cash immediately. A small cash buffer is the simplest protection against a forced sale.
- Thinking the limit caps total losses. It only limits the move in one session, and prices can rise further the next day.
Questions
People also ask.
What does limit up mean?
It means the contract has risen by the maximum amount the exchange allows in one session.
What is the opposite of limit up?
Limit down, which is the maximum permitted fall in a session.
Why do exchanges set limits?
To slow extreme moves, reduce panic and give participants time to arrange funds. The limits are reviewed from time to time as volatility changes.
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