Market Orders vs. Limit Orders, Explained Simply

Before any question of strategy, there's a more basic decision every trader makes dozens of times: how to actually place the order. It seems like a technicality, but the choice between a market order and a limit order can be the difference between a clean entry and an expensive surprise.

Market orders

A market order tells your broker to buy or sell immediately, at whatever price is currently available. It prioritises speed and certainty of execution over price — the order will almost always fill, but the exact price you get isn't guaranteed, especially in a fast-moving or thinly traded instrument.

In a liquid market during normal conditions, the difference between the price you saw and the price you got is usually small. In a volatile or illiquid one, it can be significant — a gap sometimes referred to as slippage.

Limit orders

A limit order tells your broker to buy or sell only at a specific price or better. It prioritises price control over certainty of execution — you'll never pay more (or receive less) than your specified price, but if the market never reaches it, the order simply doesn't fill.

A simple comparison

• Market order — fast, near-certain execution; price is not guaranteed.
• Limit order — price is guaranteed if filled; execution is not certain.

Which to use when

Neither is universally "better" — they suit different situations. A market order can make sense when getting into or out of a position matters more than the exact price, such as exiting quickly on a stop being hit. A limit order tends to make more sense in thinner or more volatile instruments, where the gap between the last traded price and the next available price can be wide enough to matter.

The order type is a risk decision too, not just a mechanical detail.

A word on illiquid instruments

In instruments with wide bid-ask spreads or low trading volume, a market order can fill at a noticeably worse price than expected, simply because there isn't enough volume at the best available price to fill the full order. This is worth factoring in particularly for less-traded options contracts, where spreads are often wider than in the underlying itself.

This connects directly to position sizing and risk management — an unexpected fill price changes your actual risk on a trade, even if your intended stop-loss and target haven't moved. See Position Sizing Basics Every Trader Should Know for more on planning around that.