I don't think it's related to a time period, more just random external factors. Obviously, there has to be some periodicity because a there's no such thing as

I don't think it's related to a time period, more just random external factors. Obviously, there has to be some periodicity because a there's no such thing as a back to back crash, it would just bigger crash, but I don't think there's evidence that the market will have a done year every 8-12 years.