http://quant.stackexchange.com/questions/705/do-low-volatility-stocks-outperform-high-volatility-stocks-over-the-long-run The hidden issue of low interest environment - http://cn.wsj.com/big5/20130129/opn145859.asp http://cn.wsj.com/big5/20130129/bus141954.asp Volume and price change - http://traderfeed.blogspot.hk/2017/01/trading-change-and-stability-in-market.html