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What is the bid-ask spread?

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The Daily Ledger · Markets

The broker's app showed two prices side by side, and the tutorial explained that the bid-ask spread between them was the real cost of trading.

The reader highlighted one word mid-article. Clicked made the trading term “bid-ask spread” easy to understand:

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Overview

The bid-ask spread is the gap between two prices every market carries at once. The bid is the highest price anyone will currently pay; the ask is the lowest anyone will sell for. Buy immediately and you pay the ask; sell immediately and you receive the bid. The gap between them is the cost of trading right now instead of waiting. Dealers collect it for being willing to buy whatever you are selling and hold it until the next buyer turns up.
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Overview

The bid-ask spread is what buyers are offering set against what sellers are asking. Hence the trick where you buy something, sell it ten seconds later with the price unmoved, and still come back lighter. There were always two prices: one for people buying, a worse one for people selling. The gap belongs to the middleman who'll trade with you instantly, either direction, all day. Instant service gets billed silently. 😎

A quick take — often all you need.

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Detail

The bid-ask spread exists because a market holds two prices at once. Buyers post the most they will pay and sellers the least they will accept. Until someone gives ground, a gap sits between the best of each. Trade instantly and you cross it: buying costs the ask, selling fetches the bid. Market makers collect the difference. These dealers quote both numbers all day and take the other side of whatever arrives. The gap pays them for a real risk. Buying before they know who will want the thing means holding it until a buyer appears, and absorbing any price move meanwhile. The spread is a cost even though no one bills it. Buy a share at an ask of $10.02 and sell it a minute later at a bid of $10.00. Two cents are gone, with the price unchanged. Trivial once, it is the quiet tax that makes frequent trading expensive. The width of the spread tracks how easily a thing trades. A heavily traded stock has so many participants that competing market makers push the gap down to a cent. A small stock, an obscure bond or a house has few people trading at any given moment. Whoever takes your trade may hold it for weeks before the next buyer appears, so the spread widens to pay for that wait. A wide spread is the market saying, honestly, that getting out of this quickly will cost you.
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Detail

The bid-ask spread is the buying price minus the selling price at any given instant, and you pay it silently on every trade. The screen you're staring at runs both at all times: one crowd bidding below, another asking above. Smash the buy button and you pay the ask, the higher of the two. Panic-sell and you get the bid, the lower one. The middle belongs to the professionals parked there full-time, so that "I want out right now" always has a taker. Fair enough, someone should get paid for that. The part that bites is arithmetic. Pay the gap going in, pay it again coming out, and every round trip starts underwater by one spread. Trade once a month and it's pennies. Trade forty times a day and you're running a donation drive for the middlemen. Where it really starts hurting is anything thinly traded. Penny stocks, obscure crypto, collectibles. The fewer people in the room, the wider the gap, because whoever takes your trade might be stuck with it for weeks. Check the spread before the chart. The spread tells you what leaving will cost while you can still afford to ask. 😎

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Analogy

A bid-ask spread works like the currency counter at an airport. One board shows what they pay when you sell them euros. A second, less generous board shows what they charge when you buy euros back. The gap between the boards is how the counter earns its keep, standing ready to trade with whoever walks up. Change money one way and back again without leaving the terminal and you return with less than you started, though no exchange rate moved. The counters at a busy airport quote tighter gaps than the lone kiosk in a small town. Busy markets work the same way. Rival counters and a steady stream of customers both shrink the price of convenience.
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Analogy

The bid-ask spread is a pawn shop with its two prices. The guy offers you $80 for your guitar, then hangs it in the window at $120, and neither number is dishonest. The $40 gap buys you someone open on a Tuesday afternoon, cash ready, no questions, whether or not anyone else wants your guitar today. Sell it, regret it, buy it back an hour later: same guitar, same shop, and you're $40 poorer with nothing changed but your mind. The fancy guitar shop across town pays more and charges less, because guitars actually move there. The dustier the shop, the wider the gap. 😎
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AI explanations may contain errors · Not professional advice

Formal definition — The same term, explained the usual way

The bid-ask spread is the difference between the highest posted buy price (bid) and the lowest posted sell price (ask) for an asset at a given moment, representing the implicit cost of demanding immediate execution. It constitutes the primary compensation of market makers and other liquidity providers, who bear inventory and adverse-selection risk by quoting both sides. Spread width varies inversely with liquidity: it narrows with trading volume and quoting competition and widens with volatility, uncertainty and thin participation, making it a standard measure of transaction cost and market quality. Marketable orders pay the spread; resting limit orders can earn it.

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