The USD as the world's reserve currency means, effectively, that other nations are lending the US money at the very low interest rates that Treasuries yield. Effectively, the US gets the best and biggest line of credit in the world, with which it had (until now) financed the most incredible expansion of industrial, financial and academic prowess the world has ever seen.
it also allows USA to export inflation to the entire world. Whole world will be experiencing inflation, thus, diluting the effect it has on the US population
