As a side note, anyone who wants to read a non=mathematics based explanation of how the Kelly system works should read "Fortune's Formula" by Poundstone. The "formula" is the Kelly system. Bill Gross uses it, LTCM did not:
http://en.wikipedia.org/wiki/Kelly_criterion
http://en.wikipedia.org/wiki/Bill_Gross
http://en.wikipedia.org/wiki/LTCM
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