What it means
Markets move quickly and nobody can watch every price. A trade trigger solves this by letting you decide in advance what condition should start an order, and then leaving the system to act when that condition is reached.
The most familiar trigger is the price in a stop order. A stop-loss order is set below the current price and becomes a live order once the market falls to that level, which limits the loss on a position.
A buy stop works the other way round, being set above the market to buy when a price breaks higher. Triggers can also be tied to time, such as selling a position on a given date, or to events, such as buying when an interest rate announcement is released.
In corporate treasury, a trigger might tell the system to hedge a foreign currency exposure when the exchange rate hits a target. Algorithmic trading systems build on triggers, combining several conditions before an order is sent.
For example, a rule might require that a price is above its average and that trading volume is rising, which reduces false alarms compared with a single price trigger. It is vital to understand what happens at the trigger.
A stop order usually turns into a market order when triggered, so the actual execution price can differ from the trigger price, especially when the market is moving fast or there is a gap overnight, a difference known as slippage. Triggers help with discipline, but they can also cause trouble.
A cluster of stops at the same level can speed up a fall once the price reaches it, and a trigger left unchanged after conditions have changed can lead to unwanted trades.
In practice
Real-world examples.
Example
A private investor holds shares bought at $80 and places a stop-loss order at $72. If the price falls to $72, the order becomes active, limiting the loss to roughly 10%, subject to slippage.
Example
A company expects to receive 2,000,000 euros in six months. Its treasurer sets a trigger to sell the euros forward when the exchange rate reaches a level that secures the budgeted margin.
Example
A fund manager programs a rule that buys more of an index fund whenever it falls 5% below its 200-day average. The trigger removes the temptation to delay or hesitate in a falling market.
Formula
Calculation
Stop trigger price = Entry price x (1 - Stop percentage)
Trailing stop trigger = Highest price since entry x (1 - Stop percentage)
Suppose an investor buys a share at $80 and sets a stop of 10%. The trigger price = 80 x (1 - 0.10) = 80 x 0.90 = $72. If the share rises to a high of $95, a trailing stop of the same 10% moves up to 95 x 0.90 = $85.50, so a fall to that level would lock in a gain of 85.50 - 80 = $5.50 per share, before any slippage.Case study
Seen in the real world.
Oakhaven Exports is an illustrative, fictional company that invoices customers in a foreign currency and expects to receive the equivalent of $3,000,000 over the next year. The finance director set two triggers with the bank: hedge one third of the exposure if the exchange rate moves 3% against the company, and another third if it moves 6%.
Over the next quarter the currency weakened by 3.4%, which activated the first trigger and hedged $1,000,000 at a rate that protected the budget. When the move reached 6.2%, the second trigger hedged a further $1,000,000.
The final third was left open, and the rate later recovered, giving the company a small gain on that portion. The illustrative lesson is that triggers set in calm conditions remove emotion in volatile ones, and should be reviewed regularly as the business forecast changes.
Watch out
Common mistakes.
- Assuming that a stop order guarantees the exit price, when a gap or fast market can lead to execution well below the trigger.
- Setting the trigger too close to the current price, so that normal day-to-day movement activates it and the position is sold needlessly.
- Setting a trigger once and forgetting it, even though prices, risk limits and business needs change over time.
Questions
People also ask.
What is the difference between a trigger price and an execution price?
The trigger price is the level that activates the order, while the execution price is the price at which the trade is actually done, which may be different.
Can a trigger be based on something other than price?
Yes, it can be based on time, volume, an economic data release, a change in an indicator or a combination of conditions.
Are trade triggers only for professional traders?
No, most online brokers offer stop and limit orders to individual investors, and company treasury systems offer similar rules for currency and interest rate hedging.
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