Execution and Order Flow
Most traders use one order type for everything because that is what they learned first. But the choice between a limit, a market and a stop entry is a trade-off between certainty of fill and quality of price, and different setups need different sides of that trade-off.
What each order actually buys
| Order | You get | You pay | Best used when |
|---|---|---|---|
| Limit | Price control | Risk of no fill | Mean reversion, pullback entries, ranges |
| Market | Certain fill, now | Spread plus slippage | Exits, risk reduction, time-critical entries |
| Stop entry | Confirmation of direction | Worst price of the three | Breakouts and momentum continuation |
The pullback trader should almost never use market orders
If your edge is buying weakness inside an uptrend, the whole thesis is that price will come to you. Chasing with a market order converts a favourable entry into an unfavourable one and quietly destroys the reward-to-risk ratio the backtest was built on. Missing a third of your entries is the cost of the method, not a flaw in it.
The breakout trader pays for confirmation
A stop entry above resistance guarantees you are never long into a market that fails to break. That certainty is expensive: you buy after the move has started, often into the first burst of volatility. Accept the price, but insist on a corresponding widening of the target. A breakout method with a two-to-one ratio measured from the pre-breakout level is frequently a one-to-one method measured from a realistic stop-entry fill.
Exits are different
For exits the priority inverts. Getting out is about certainty, not price. Use market orders for discretionary exits and resting stops for defined invalidation, and stop trying to shave a pip on the way out of a losing position. The trader who converts a stop loss into a mental stop to avoid slippage has traded a small known cost for an unlimited unknown one.
- AResting stop loss in the market from the moment the position is open.
- BPartial profit taken with limits at pre-defined levels.
- CDiscretionary exit by market order when the thesis breaks before the stop.
Choose the order type from the logic of the trade, not from habit. The habit costs about a pip a trade, every trade, forever.
Written by Adrian Vestberg — former interbank FX dealer, now running a two-person discretionary desk.