Publisher: Hill and Wang
Authors: William Poundstone
List Price: $27.00
Amazon Price: $17.01
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Reviews:
Summary: interesting but rambling read
the author ties together a number of disparate stories but the key takeaway from a practical perspective was: manage risk and do your homework.
Summary: The Ongoing Epic of the Kelly Criterion for Risk Management.
"Fortune's Formula" tells the story of the Kelly Criterion -through the experiments, ideas, wins, and losses of those who have espoused it and who have derided it, at race tracks, black jack tables, sports books, and, finally, on Wall Street. The Kelly Criterion is a risk management formula published in 1956 by Bell Labs information theorist John Kelly, Jr. that dictates how much of your bankroll you should bet based on your edge divided by the odds so that you will have zero risk of ruin no matter how bad your luck is, while increasing wealth faster than any other betting system. It does not address what bets you should make, which is another matter entirely. Instead of writing a simple analysis of the Kelly Criterion, author William Poundstone brings this story alive by relating the histories of key figures who have used, promoted, or criticized the Kelly Criterion: information theorists, economists, traders, gamblers, and gangsters. Some readers may find this approach unfocused and unnecessary. But I think the personalities lend "Fortune's Formula" an epic quality and place the Kelly Criterion firmly in the context of real life, with real consequences, as opposed to the realm of abstruse theories that never leave the halls of academe.
The men whom "Fortune's Formula" casts as protagonists are Claude Shannon, the MIT scholar who invented information science and who amassed a small fortune as a buy-and-hold investor, typically making 28% per year on a small portfolio, and Ed Thorpe, author of 1962's gambling classic "Beat the Dealer", 1967's "Beat the Market", co-founder of Princeton-Newport Partners fund (1969-1988) and founder of Ridgeline Partners (1994-2002) quant fund. Ed Thorpe's transformation from MIT egghead to black jack sharp to Wall Street wizard in an ongoing theme, as Thorpe is an immensely successful advocate of the Kelly Criterion -and he is still alive. There is unfortunately little information on John Kelly, because he died in 1965 at the age of 41. The key Kelly challenger is 1970 Nobel Laureate economist Paul Samuelson, who probably overstates his case in calling the Kelly Criterion a "complete swindle" when the point of disagreement seems to be the concept of "utility" in long-tern outcome. Whatever one thinks of Samuelson's outspoken arrogance, he is certainly entertaining. Mobster Manny Kimmel makes an appearance, as do traders Ivan Boesky, Michael Milken, and John Meriwether, as well as numerous information theorists.
William Poundstone obviously has a point of view. He is an advocate of the Kelly Criterion, believing that it produces better results than any other betting system over the long haul while withstanding even the most unlikely confluences of catastrophe that have a way of manifesting themselves periodically. He doesn't support efficient market hypothesis. He thinks people can, and have, made money consistently on the stock market. -But that you need a darned good method of managing risk to do it, a better method than Value at Risk reports. "Fortune's Formula"'s fascination is not only in its history of the Kelly Criterion, but in the realization that a risk management formula has so many seemingly disparate applications. As Poundstone says, "The idea pops up in the strangest places."
Summary: Takes a while for everything to come together, but well worth continuing with
This book gives a very good overview of the Kelly betting system for deciding what proportion of your 'pot' should be staked on a bet with given odds/return. Whilst the first part of the book seems illogical, jumping from one story to another, it maintains it's pace until all parts are brought together. An attempt is made at presenting both sides of the arguement for and against the Kelly system, although the book is very clearly biased in favour.
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