再次證明一個人在一家公司的成功不一定能在另一家公司複製成功
http://blogs.wsj.com/deals/2013/04/08/ackman-thought-johnson-could-turn-around-titanic-jcpenney/ http://www.forbes.com/sites/steveschaefer/2013/04/08/ron-johnson-out-at-j-c-penney-replaced-by-former-chief-mike-ullman/