How a Trade Actually Happens
Every trade needs a willing buyer AND a willing seller at the same price, at the same moment.
Liquidity describes how easily a stock can be bought or sold without moving its price much. A stock with millions of shares trading hands daily (high volume) is usually highly liquid - you can get in or out near the current price.
The bid-ask spread is the real-time gap between the highest price a buyer will currently pay (the bid) and the lowest price a seller will accept (the ask). A tight spread (a few cents) signals healthy liquidity; a wide spread is a red flag that few people are actively trading that name right now.
Volume itself matters beyond liquidity too - a big price move on unusually high volume is generally read as more meaningful (more real conviction behind it) than the same move on a quiet, low-volume day.
GME has, at different points in its history, swung between extremely thin liquidity and viral, massive-volume trading days - a good real example of how differently the SAME stock can behave depending on who's actually trading it that day.
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