A spread is the difference between the buy (ask) and sell (bid) prices quoted for an asset. The spread is a key part of margin trading, as it is how derivatives are priced.
For example, AAPL's bid price is $147.25 and the ask price is $147.30. In case you want to buy, you can buy at the price of $147.30 (best offer). In case you want to sell, you can sell at the price of $147.25 (best bid). $0.05 is the spread.
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