Bid Offer spreadIn a Bid Offer spread, The (highest) Bid and (lowest) offer prices for them period are plotted above and below the current price. The bid price is the highest price of any of the buy orders presents in the market at the time, while the offer is the lowest price of any of the sell orders present in the market at the same time. Occasionally for a few minutes the bid becomes higher than ask, this happens when the volume of orders gets so high the trading room floor can't keep up.
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