The very big picture (a historical perspective): The long-term valuation of the market is commonly measured by the Cyclically Adjusted Price to Earnings ratio, or “CAPE”, which smooths-out shorter-term earnings swings in order to get a longer-term assessment of market valuation.  A CAPE level of 30 is considered to be the upper end of the normal range, and the level at which further PE-ratio expansion comes to a halt (meaning [...]