Now Playing: 12-18-12 Marketplace

The photo-sharing service Instagram has changed its privacy policies to allow your photos to be used in advertisements, and users aren't happy. Kai Ryssdal talks to game designers at USC's Interactive Media department about what goes into designing a game and what makes some of them so addictive. Labor unions in Michigan took a blow when the “right to work” law passed last week-- Krissy Clark reports on the history and the future of unions. After President Obama proposed he’ll extend Bush-era tax cuts for households making less than $400,000, we wonder whether $400,000 is the new rich. And reporter Dan Gorenstein visits Newtown, Conn., to see what small businesses are doing to help after the tragedy.