TL;DR:<p>"Imagine you earned $100,000 a year and you didn`t have any debt. You can go to a bank and borrow $10,000 a year. You can spend, therefore, $110 a year. When you spend $110,000 a year, somebody else earns $110,000 and they can go to a bank and there`s a self-reinforcing process in which your debt rises in relationship to your income.<p>And that goes on for a long time and that goes on for 50 or 75 years through history. We`ve had 50, 75-year cycles and then you reach a point where you can`t anymore get more debt and the process starts to change."