You'd think that online brokers were giving the stocks away, the way investors are flocking to the Web. The numbers are staggering, and it's not just day traders. The mania's gone mainstream. E~*Trade says it opens some 3,000 new accounts daily. In three years a practically nonexistent industry has grown to 150 online bro-kers, 11 million online accounts and more than half a million trades a day.
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