Quote from failed_trad3r:
Well, since the S&p is a broad based index, is it less likely to trend compared to commodities and currencies. So a reversion to the mean is more likely. That said, the last 2 years were abnormally trendy for the S&P.
So, the S&P reverts to a mean, but you cannot say what that mean should be because if you had identified a mean value area and indeed faded the market you would have gotten crushed. For the past two years. But other than that it is not trendy.
Put up a Weekly consolidated chart for the S&P 500 for the past 30 years and say that. With a straight face.