Bid-ask spread
The gap between the best available buying and selling prices in a market.
In more detail
The spread separates the price immediately available to a seller from the price immediately available to a buyer. It often widens in thin or unsettled markets and is one part of trading cost. Fees and price movement can add more, while some platforms use spread for a separate pricing charge.
How you might use it
You see a 99 best bid and 101 best ask: immediately selling and immediately buying start on opposite sides of that 2-point spread.
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