In an inflationary economy like the one we have, "the market is at all time high" is not really a useful statement since it's the normal state of affairs.
I'm going to rightly be accused of ad hominem for pointing this out, but entertain for a moment that the people calculating inflation are generally directly or indirectly funded by the same federal government that causes inflation.
https://www.gurufocus.com/economic_indicators/4534/inflation...