After reading Taleb and knowing the standard deviation calculation (assuming a normal distribution) is a poor predictor for the fat tails evident in market returns, I now model a 10 standard deviation monthly return risk just to ensure I can survive it. A 10 standard deviation move happens much more often in real life (due to the fat tails) than would be predicted by the normal distribution. The 10 standard deviation loss (on a monthly basis) was not that far off of what I saw this past September thru November.
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