The invisible hand that pushed Apple up and down for six yearsUntil last week, 45% of trades were visible to high-frequency traders but not to the public.
<p>FORTUNE -- What if you could see the prices of the stocks you're following only once a day, but other investors following the same stocks could see the prices as they changed?</p>
<p>That, in broad strokes, was the situation from 2007 (when the Securities Exchange Commission created a national market system) until last Monday, Dec. 9,
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The invisible hand that pushed Apple up and down for six years
