By Bob Pisani, CNBC Reporter
NEW YORK ( CNBC) -- Citigroup ( C), a day after its earnings, was again trading 300 million shares after the first hour-and-a-half of trading. The trading in Citigroup has become an entire sub-industry of trading. There are thousands of traders making a living on Wall Street doing nothing but trading Citigroup stock. Why? A low-priced, high volume stock offers a perfect opportunity to profit two ways: 1) playing the spread and 2) rebates.
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