High P/E ratios, inflation, advice that "this time, its different", all familiar signs that people are starting to believe that gravity doesn't really exist. Investment seminars used to cite things like "if a worker had started investing 40 years ago..." (ie 1950) I'd always think of my poor grandfather who lost his bankroll in 1929, took him the rest of his working life to recover. The question is whether MMT is delaying what would ordinarily be a recessionary "correction", kicking the can down the road to an inevitably historic crash, as investors lose faith in governments en masse.