In this paper we want to trace back the origin of what has been called the low volatility In particular we are in line with the work of [11, Hsu, Kudoh and Yamada (2013)] which demonstrated the fact the analysts were too optimistic on future Earnings estimates. We have conducted a similar analysis on European stocks from 1998 to 2017. In addition to the initial findings of this paper we have studied the Earnings forecast bias on long-term Earnings growth, as well as their consequence on Earnings revisions on the most volatile stocks. W can confirm that consensus forecasts systematically overestimate EPS and future EPS growth for high-vol stocks. We believe that these behavioural misperceptions are the main structural drivers of this anomaly. Persistent over-optimism bias on high-vol stocks induces negative EPS revisions and negative EPS surprises that, in turn, favour the performance of low-vol stocks. Furthermore we have extended this study to the analysis of low-beta and low-correlation stocks where similar behavioral bias has been seen.