They plot the markets trailing P/E ratio against CPI inflation (right hand side) and the 10-year real treasury yield (left hand side).
The data is from 1948 to today and sourced from BofAML
As real-rates go negative or inflation falls multiples tend to be lower.
KKR analysis suggests there isn’t some funny data skewing results here.
What about today? at the current real 10-year yield of -1.5% and inflation rate of 2.3% (likely to fall) the 17.5x P/E ratio for the market (since increased) stands out as too high.
These types of equity strategy charts are good to hang on to.