Economists predict the future course of economic events only to demonstrate they have a sense of humor. If we knew about such things with any degree of certainty, we would not be the billionaires Bernie wants to eradicate; we would be trillionaires.
We are not. By the way, did you notice that while Senator Sanders used to inveigh against “millionaires and billionaires,” he has recently dropped his criticism of the former maybe because he recently joined their ranks.