Alan Greenspan speaks truth about reality.
"The United States can pay any debt it has because we can always print money to do that. So there is zero probability of default"
Sure... the government can always just print more money to cover the tab on their spending. But, when they do, it steals value from every dollar already out there... including yours. Printing money is a tax, and a particularly nasty one. It has every bad effect of raising taxation, multiplied by the fact it strikes right to the heart of the weakest segments of the population.