Midas Oracle is the #1 source of information on prediction markets:
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Go reading that old post, people. And be proud to be a Midas Oracle subscriber. On a daily basis, I give you scoops that the Freakonomics blog will give you one year later, if any.
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Previously: Cantor Exchange
External Link: HSX posts by Midas Oracle indexed by Google
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http://www.portfolio.com/views/blogs/market-movers/2007/10/04/a-brief-history-of-hsx