Chipotle

Forget fourth meal -- now Taco Bell is serving up new menu items that seemingly aim to compete with Chipotle. Will the strategy really work?

Shares of Chipotle Mexican Grill dropped about 2 percent yesterday, after the company announced that federal prosecutors are investigating the company's compliance with immigration laws in its hiring practices.

Steve Ells talks about the Mexican eatery's role in today's food economy, its troubled past in hiring employees and its plans for expansion in the future.