Market Order

A market order is an instruction to buy or sell immediately at the best available price, taking whatever liquidity is resting on the order book. Execution is guaranteed but price is not: a large market order can fill across many price levels, paying 1 percent or more beyond the quoted price in thin conditions.

Why it matters

The market order is the tool of urgency, and urgency has a price. The difference between the expected and achieved fill, slippage, grows with order size and shrinks with market depth. Exchanges also charge takers, those who remove liquidity, higher fees than makers. For small trades in liquid pairs these costs are trivial; for large trades they are the dominant consideration, which is why professionals rarely send raw market orders at size.

Forced liquidations in leveraged markets are market orders by construction, which is why liquidation cascades move price so violently.

In the gold vs bitcoin debate

A retail gold purchase is effectively a market order against a single dealer's quote, spread included, with no competing book in sight. Bitcoin gives even small buyers exchange-grade execution around the clock. The practical lesson is the same in both markets: paying up for immediacy is a choice, and patient execution is usually cheaper.