Monthly Archives: June 2012

Falkenblog: Is Spitznagel an Apostate?

Taleb is listed rather prominently on the Universa Website and Spitznagel graciously credits Taleb in the paper, but Taleb and/or Spitznagel have put a fork in the archetypal Black Swan theory (and yet, Taleb has never been really consistent, so one can say he meant this all along at some level). I have no doubt some people can predict infrequent events, and perhaps Spitznagel is one of them. Yet it’s pretty hard to validate objectively, and in my experienced is best done via observing all the little good investments someone has made for 10 years, something that is impossible to do in scale. The idea that if you can predict infrequent events you can do very well for yourself is true enough, but that’s a lot less useful to know than if rare events are unappreciated in general, which turns out not be be true.

via Falkenblog: Is Spitznagel an Apostate?. HatTip to Dave Lull

LESS IS MORE

LESS IS MORE

I discovered that I had been intuitively using the less-is-more as aid in decision-making (contrary to the method of putting a series of pro-con side by side on a computer screen). For instance, if you have more than one reason to do something (choose a doctor or veterinarian, hire a gardener or an employee, marry a person, go on a trip), just don’t do it. It does not mean that one reason is better than two, just that by invoking more than one reason you are trying to convince yourself to do something. Obvious decisions require no more than a reason. Likewise the French army had a heuristic to suspect absenteeism explained by more than one reason, like death of grandmother, cold virus, and being bitten by a boar. If someone attacks a book or idea using more than one argument, you know it is not real: nobody says “he is a criminal, killed many people, and he also has bad table manner, bad breath and is also very poor at driving”.

via LESS IS MORE I… | Facebook.

Nassim Taleb and Infrastructure | Price Roads

To my surprise, Taleb emailed me back a link to a PDF of a draft of a chapter of his new book. If you’re used to Strunk and White-style economy in prose I’ll warn you to focus on the ideas and ignore Taleb’s intentionally ? meandering style. Taleb emphasizes using stressors to make sure something is resilient; and I’ve wondered if he tests his work by including doses of insult, stereotyping, and health advice. Anyway, I don’t mean to praise with faint damning. An excerpt:

Let us start as usual with a transportation problem, and generalize to other areas. Travelers typically do not like uncertainty —especially when they are on a set schedule. Why? There is a one way effect. I’ve taken the very same London-New York flight most of my life. The flight takes about 7 hours, the equivalent of a short book plus a brief polite chat with a neighbor and a meal with Port wine, stilton cheese and crackers. I recall a few instances in which I arrived early, about twenty minutes, no more. But there have been instances in which I got there more than two and three hours late, and, in at least one instance, it has taken me more than two days to reach my destination. Because travel time cannot be really negative, uncertainty tends to cause delays, making arrival time increase, almost never decrease. Or it makes arrival time just decrease by minutes, and increase by hours, an obvious asymmetry. Anything unexpected, any shock, any volatility is much more likely to extend the total flying time.

via Nassim Taleb and Infrastructure | Price Roads.