Variable price limits allow futures contracts to move beyond their fixed price limits in a single day. Due to the high volatility of the commodities market, price limits are imposed on future contracts to ensure a regulated market. Trading stops when contracts hit their price limits.
However, sometimes with heavy trading volumes, a variable price limit mechanism can be implemented, so that after reaching its initial fixed price limit, a futures contract can move beyond that limit in the next trading day.
A price limit is the maximum range that a futures contract is allowed to move up or down within a single day.
Price limits are re-calculated every day.
When price limits are reached in one day, the variable price limits might be implemented to expand the initial limits to the variable amount for the next trading day.
What is a Price Limit?
A price limit is the maximum range that a futures contract is allowed to move up or down within a single day. It is set by the exchange to prevent excessive daily volatilities in the futures market.
When a product reaches its highest price allowed, the product is “limit up,” when it reaches the lowest price allowed, it is “limit down.” When the product is limit up or down, different actions can occur. The trading might be stopped for that single day, or the market might temporarily halt until the price limit is expanded.
According to their regulatory rules, different future contracts have different levels of price limits, as well as actions after the price hits the limits. For example, agriculture futures usually have both upside and downside limits.
Equity index futures only have limits on the downside without upside limits, plus an overnight limit up and down. Price limits are re-calculated for every trading day. Generally, agriculture futures go limit up or down more often than equity index futures do.
Price limits are subject to the rules set by exchanges. Different exchanges may implement different rules. They may also alter their rules over time. Futures contract traders must be aware of these rules and changes.
Initial Price Limit vs. Variable Price Limit
There are two parts in the price limits for some futures contracts: an initial price limit and a variable price limit (some futures contracts do not have variable price limits). Initial price limits are fixed, restricting the transactions from settling above the upper limits or below the lower limits. Variable price limits allow for higher limits when the market goes high and lower limits when the market goes low.
For products with variable price limits, when they reach the initial price limits for one day, variable price limits may be implemented in the next trading day, which expands the initial limits to the variable amounts for that day. The expanded limits will remain until there are no more contracts settled at the expanded range.
The mechanism allows the products to be traded beyond their initial price limits so that more traders can enter or exit the market. Less restriction improves market efficiency, and the prices can move back to the fair values more quickly.
Variable Price Limit – Example
A variable price limit mechanism is implemented for a lot of agriculture futures. As the diagram shows below, corn futures have two levels of limit up and down.
Level 1 gives a fixed initial limit of $0.25 per bushel, which means corn can move $0.25 up or down in that trading day from the closing price of the previous day. Level 2 is a variable price limit of $0.40 per bushel, which gives an expansion of $0.15 per bushel beyond the initial price limit.
If corn closed at $3.50 in the previous trading day, it would have a limit up at $3.75 and a limit down at $3.25 today. When either of the limits is hit, the market will be temporarily closed for that day, and the price limits for the next day can be expanded for another $0.15 to $0.40.
If corn goes limit up and closes at $3.75, the limit up for the next day will be $3.75 + $0.40 = $4.15. If it goes limit down and closes at $3.25, the limit down for the next day will be $3.25 – $0.40 = $2.85.
A larger permitted price range allows the market to move back to its fair value more quickly. Once trades are not settled in the variable price limit anymore, the initial price limit is implemented again.
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