and systemic. so if people can be systematically irrational, then markets can be systematically irrational but is how they infiltrate economics. >> one of the classic cases that they point out is what's called regression to the mean. so anytime somebody has a streak, a lucky streak in gambling in, sports had, hollywood executives are often promoted because the last six movies they made were fantastic. and then people are always surprised that the next six movies aren't that good. >> right. >> or and what their point is, this should have been predictable because it's like coin tosses. if you get seven heads in a row, chances are at some point you'll start getting tails. >> but they would say that that's true what you just said is true. what's going on there people seeing patterns, meaningful patterns where the patterns are not meaningful. every wall street con man knows