Now Playing: 1-2-13 Marketplace

The fiscal cliff has been averted, but the payroll tax cut still expired -- how might this affect your paycheck? As people begin to work on their New Year's resolutions, we explore the "gym-conomy." By one estimate, Hispanic consumers contribute more than a trillion dollars to our economy, with Latina shoppers being the most savvy about their buying. Sarah Gardner talks to the Atlantic’s Jesse Eisinger about his behind-the-scenes article on banking in America. And in the latest "BURN: An Energy Journal" piece, Alex Chadwick looks at what life’s like for the scientist trying to invent a whole new type of battery.