John Hussman’s view:

Presently, our valuations measures suggest clear overvaluation (our estimated 10-year total return for the S&P 500, based on a variety of models including the operating earnings model presented a few weeks ago, is only about 5%-5.4% annually), market action is strenuously overbought, market internals are relatively positive, but economic pressures are still negative, and sentiment is once again bullish enough to define an “overvalued, overbought, overbullish” condition.