Quote Fading and Liquidity Withdrawal

Displayed quotes on an exchange aren't a firm promise held open indefinitely — they can be cancelled and replaced in microseconds. Quote fading describes what happens when a market maker sees a signal suggesting the incoming order flow is dangerous (informed, or arriving just after a fast price move elsewhere), and pulls its resting quotes before that flow can trade against them. From the perspective of a slower trader, the liquidity that appeared to be sitting on the book a moment ago simply "fades away" the instant they try to hit it.

This behavior is a rational response to adverse selection: a market maker quoting continuously will occasionally get run over by a trader who knows something the quote hasn't priced in yet (a large fundamental order, or a price move already visible on a related instrument or venue). Reacting fast enough to withdraw quotes before that flow arrives protects the market maker's book, but it also means that displayed liquidity is systematically less available exactly when it would be most useful to the aggressive trader — a form of adverse selection working against slower participants.

Worked example. A stock is quoted $50.00 bid / $50.02 offer. A related futures contract ticks up sharply, signaling the stock's fair value has likely moved higher too. A fast market maker cancels its $50.02 offer within a few microseconds of seeing the futures tick; a slower trader whose buy order was already in flight, aimed at that $50.02 offer, arrives to find it gone, executing instead against a worse price further up the book.