请教bid-ask spread

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我的理解是这样的，请问下对不对：
卖方要价5，买方开价4，
成交结果：
卖方收到4，买方付5.

中间的1是bid- ask spread，归交易所了？

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关键词：spread READ Ask bid EAD 请教 spread

you misunderstand.

bid-ask spread


The amount by which the ask price exceeds the bid. This is essentially the difference in price between the highest price that a buyer is willing to pay for an asset and the lowest price for which a seller is willing to sell it.
Investopedia explains Bid-Ask Spread
For example, if the bid price is $20 and the ask price is $21 then the "bid-ask spread" is $1.

The size of the spread from one asset to another will differ mainly because of the difference in liquidity of each asset. For example, currency is considered the most liquid asset in the world and the bid-ask spread in the currency market is one of the smallest (one-hundredth of a percent). On the other hand, less liquid assets such as a small-cap stock may have spreads that are equivalent to a percent or two of the asset's value.