Stocks rally as investors continue to analyze Federal Reserve Chair Janet Yellen's Friday speech.
Shares of Herbalife rose Monday on news Carl Icahn increased his stake. But Jim Cramer is more cautious.
The ongoing feud between Bill Ackman and Carl Icahn heated up after Icahn disclosed a new stake in Herbalife.
Unlike Bill Ackman, TheStreet's Jim Cramer doesn't believe that Herbalife (HLF) has zero earnings power.