What is the difference between a market order and a limit order?
A market order executes immediately at the best available price; a limit order executes only at your specified price or better, but may not fill.
When you place a trade, you choose how it should execute. The two most common instructions are the market order and the limit order, and the difference comes down to a trade-off between speed and price control.
A market order says: "Buy (or sell) right now at the best available price." It prioritises certainty of execution. A market buy will fill against the lowest ask, and a market sell against the highest bid, almost instantly while the market is open. The advantage is speed and the near-guarantee of getting done. The drawback is that you do not control the exact price — in a fast-moving or illiquid stock with a wide bid-ask spread, you might fill at a worse price than the last quote you saw, an effect called slippage.
A limit order says: "Buy at no more than X" or "Sell at no less than Y." It prioritises price control. The order will only execute at your limit price or better. A limit buy at Rs 100 will fill at Rs 100 or lower; a limit sell at Rs 110 will fill at Rs 110 or higher. The advantage is that you never pay more (or receive less) than you decided. The drawback is no guarantee of execution — if the market never reaches your price, the order simply sits unfilled, and you may miss the move entirely.
Which to use depends on your goal:
- Use a market order when getting filled quickly matters more than a few paisa of price — for example, exiting a liquid blue chip where the spread is tiny. - Use a limit order when price discipline matters — buying a thinly traded stock with a wide spread, setting a target entry below the current price, or selling into strength at a chosen level. Limit orders also protect you from slippage in volatile, news-driven sessions.
On the PSX, daily circuit breakers add another wrinkle: if a stock is locked at its upper or lower limit, a market order may not fill because there are no shares available on the other side at that price, so a limit order at the limit price simply queues.
Many disciplined investors default to limit orders to avoid overpaying in illiquid names, reserving market orders for situations where immediate execution genuinely outweighs price precision.