Naturally, if one is tuned to only filter any bubble mentions, one will naturally have a cognitive bias of interpreting the world only through the eyes of "bubble watchers." The flipside of course is that not everyone is a mindless member of the herd, rushing headlong into whatever precipice awaits lemmings just around the corner, and can still do simple math and recall what fundamentals looked like (as a reminder, forward multiples in 2007 looked very cheap too...before EPS for the S&P in 2008 plunged by over 50% which in retrospect would have made those forward multiples 100% higher).

But simple logic failure aside, what empirical evidence shows is that while there has been indeed a pick up in internet mentions of "stock bubble" according to Google Trends, it is still well below its prior high...