Why the checkout counter is so profitable. Citymart.com via http://www.flickr.com/photos/interlace-invent/4071684282/ creative commons Accidentally buy much more than you intended?

You may not have been planning on it, but the store certainly was. From supermarkets to clothing boutiques, shopping hubs are carefully engineered to get you to spend the most money possible.

Want to beat retailers at their own game? Then you'd better learn how they think.