Be far more reaching than the fall of the USSR because many other economies are tied to ours. Other central banks are heavily invested in the US stock market. For now it props up the stock market. But if the dollar OR the stock market show signs of faltering, they will pull all their investments to prevent as much loss as possible. Same with Treasury bonds. Other countries (if smart) will take a hit but not major. Here, it will cause a disastrous cascade effect unlike anything seen before. I said “if” but it really should be “when”. Which is soon.