Market orders fill now but risk slippage; limit orders lock your price but may never fill. Here's when each wins — and when each fails.
Every trade starts with choosing an order type. The two most fundamental options — market order vs limit order — trade off two things you can't fully have at once: certainty that your order fills, and certainty of the price you pay or receive. Knowing when each wins (and when each fails) matters more than memorizing the definitions.
A market order instructs your broker to buy or sell immediately at the best available price in the order book. It virtually always fills, and fills fast — but on a fast-moving or thin stock, the price you actually get can differ meaningfully from the last quoted price you saw before clicking submit, a gap known as slippage. Market orders make the most sense on liquid stocks where the bid-ask spread is tight and slippage is minimal.
A limit order specifies the exact price (or better) you're willing to accept — a buy limit only fills at that price or lower, a sell limit only fills at that price or higher. You know exactly what you'll pay or receive if it fills, but there's no guarantee it fills at all: if the stock never trades at your limit price, the order simply sits unfilled (or partially filled) until you cancel it.
Many experienced traders default to limit orders even on liquid stocks, setting the limit price just a few cents beyond the current quote — this behaves almost like a market order in normal conditions but adds a hard ceiling against an unexpectedly bad fill during a sudden volatility spike, when a plain market order offers no such protection.
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