Cap and Trade is the linchpin of the government's effort to curb carbon emissions. Senior Editor Paddy Hirsch explains how the cap and trade model works.

There is a worldwide deficit of skilled workers -- i.e. plumbers, electricians, carpenters. These workers provide essential services -- albeit unsexy -- but somebody's gotta do it, especially if the economy's going to recover.

Everybody likes a good discount, but people respond differently when items are free. Behavioral economist Dan Ariely talks with Kai Ryssdal about why we show restraint for things that don't cost us anything.