Yes. You don't see it too much in ad recommenders because they don't need to be correct at the tails as long as you're rightish most of the time. Elements of

Yes. You don't see it too much in ad recommenders because they don't need to be correct at the tails as long as you're rightish most of the time. Elements of it show up in autonomous vehicles. For example, one thing that can cause a disconnect is when sensors detect a sequence of events that is extremely improbable. If it's improbable enough, it's probably not the world, it's probably your model. Best to hand it to a human or hit the brakes. It reminds me a bit of John Meriwhether's statement that the events that led to LTCM's collapse were a "Six Sigma Event." If you are getting a six sigma event and you've only been in business a few years, maybe it's because your probability distribution of the market is wrong when you get a little too far from the mean.