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):