Moments ago, Janet Yellen was asked if there is something out of place with the S&P hitting all time highs at a time when even she (not to mention numerous other Fed presidents) discuss froth in the bond markets. Her answer: no. Specifically, based on some "model" the Fed watches to get a "feeling" for valuations, she concluded the equity valuations are not out of historical norms.
In other words, "no bubble here."
And here is what JPM had to say about that.
Even assuming trailing earnings are valid, sustainable, and not goosed by the Fed itself (not to mention non-GAAP accounting gimmickry): the most recent median S&P 500 Price to Earnings ratio as of this moment is higher than 89% of all P/E prints in the history of the market. Said otherwise, equities have only been more expensive just about 10% in the history of the S&P.
What the hell do you expect her to say? Obviously if she said "the markets are clearly overvalued, and I suggest everyone start taking their profits," we'd have a crash. Government workers are good at lying to the public.