US equity fundamentals
The Shiller CAPE (cyclically adjusted price-earnings) ratio is one of the most common indicators used to assess whether equities are under or overpriced relative to long-term fundamentals. The following chart displays the correlation between core inflation and the CAPE.
The period from 1990 to 2009, and the decade after the financial crisis, were marked by rather low inflation rates combined with high equity valuations.
With inflation surging to levels not seen since the 1970s, current equity valuations are thus far too high, based on the relationship mapped out below. We can therefore expect further declines in the US stock market over the next year.