"Historically-informed investors are being given a hint of advance
warning here, in the form of a strenuously overvalued market that now
demonstrates a clear breakdown in internals. We observe these
breakdowns in the form of surging credit spreads (junk bond yields
versus Treasury yields of similar maturity), weakness in small
capitalization stocks, and other measures. These divergences have
actually been building for months, but rather quietly. Note, for
example, that as the S&P 500 pushed to new highs in recent weeks,
cumulative advances less declines among NYSE stocks failed to confirm
those highs, while junk bond prices were already deteriorating. We
don’t take any single divergence as serious in itself, but the
accumulation of divergences in recent weeks should not be ignored." John Hussman, PhD