what a bargain!!, page-268

But you haven't, and remember the mathematical models, have limitations. All of them errors of uncertainty, and are far from a 100% predictive value. Mathematical models fail to predict outlier events. Disruptions in technologies are one of those outliers, and precisely why Mac Bank, and other bears continuously get it wrong. And the thing is we are living in an era of outliers, Brexit, Trump elected, etc. I would say these outlier events are becoming a new normal, and the mathematical models, will need to be re-calculated to adjust for these new variables.