eBay and the Brain: What Psychology Teaches Us about the Economic Downturn (and healthy behaviors): Scientific American
Most of the useful books I have read this year about understanding why we do what we do (such as Nudge: Improving Decisions About Health, Wealth, and Happiness, Influencer, Predictably Irrational: The Hidden Forces That Shape Our Decisions, Sway: The Irresistible Pull of Irrational Behavior, Freakonomics [Revised and Expanded]: A Rogue Economist Explores the Hidden Side of Everything, etc.) have been written by behavioral economists.
Here’s another interesting article by a behavioral economist that starts off talking about eBay, but ends up talking about our behaviors around food, too — specifically, that “by taking our own irrationality into account, we can improve our health and well-being.”
Good stuff — check it out.