What is a market order?
A market order instructs the venue to execute against available liquidity. It prioritizes execution rather than guaranteeing one exact price.
If the requested quantity is larger than the amount available at the best price, the order may fill at multiple price levels.
What is a limit order?
A limit order specifies a maximum purchase price for a buy or a minimum sale price for a sell.
Price control comes with execution uncertainty: the market may never reach the limit, or available liquidity may only partially fill the order.
Execution certainty vs price control
Market orders offer greater execution immediacy but expose the trader to spread and slippage. Limit orders provide price control but can remain unfilled.
Execution example
Assume the lowest ask is 60,000 for 0.10 BTC and the next ask is 60,020 for 0.50 BTC.
Buying more than the best ask contains
A market buy for 0.30 BTC could consume 0.10 BTC at 60,000 and another 0.20 BTC at 60,020. The average execution price would therefore be above 60,000.
Common mistakes
Assuming market means exact displayed price
The displayed best price may contain less quantity than the order requires.
Assuming a limit order must fill
A valid limit price does not create a counterparty willing to trade there.
Ignoring exchange-specific order behavior
Post-only, reduce-only, stop and time-in-force rules can differ by venue.
Key takeaways
- Market orders prioritize execution rather than an exact price.
- Limit orders control the acceptable price but do not guarantee execution.
- Large orders can fill across several order-book levels.
- Liquidity, spread and volatility affect execution quality.
Sources & further reading
This lesson is educational material. Market structure, exchange rules, fees, margin requirements and derivatives mechanics can differ by venue and can change over time. Verify current rules with the venue you use.