Herbalife perseveres amid 'pyramid scheme' accusations

Herbalife's stock has surged 130% this year as the firm posted growing profits and won a key legal case, deflecting bets by activist investor Bill Ackman that it would fail.A year ago, activist investor Bill Ackman rocked Wall Street with a $1-billion bet that shares of Herbalife Ltd., the Los Angeles seller of weight-loss and nutrition products, would slide to zero.