“To buy a stock you must quote the right price. The "right" price is known as the National Best Bid and Offer (NBBO) and is determined, of course, by the market's demand for a stock.
Quote the right price, and you can buy. It's as simple as that. Until it's not.”
Nanex, a Chicago-based market research firm, has produced a chart that illustrates what can stand in a trader's way when they're trying to quote the right price
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