Electronics, surprise, keep getting cheaper. A hard drive that stores a trillion numbers and slips into a briefcase costs $200. A desktop version costs less than $100.

Meanwhile, electronics are spurring huge growth in trading. In 2005, the New York Stock Exchange traded 2 billion shares a day. Now, 10 billion shares a day across a burgeoning number of electronic exchanges is commonplace (Data Sweep, October 5, page 22).

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