The manipulators try to influence the stockprice movement by trading if they hold main chunk of shares and in thiscase market index movement has little effect on stock price movement,causing the Beta coefficient low.

• 当操纵者持有相当多的股份时,总是试图通过交易影响股价走势,股价涨跌受大盘涨跌的影响相对较小,从而导致低贝塔系数现象。