Add Yahoo as a preferred source to see more of our stories on Google. Shoppers in the Costco aisles - Steve Proehl/Getty Images We've all experienced the frustration of looking for a certain item on ...

Ever noticed how you're always walking the length of the entire grocery store just to grab a gallon of milk? That's not an accident. It's not sloppy planning or bad luck with the building's plumbing.

Despite the popular theory, milk isn't tucked in the back as part of a secret retail strategy. Cold-storage infrastructure, delivery logistics, and the demands of stocking large quantities of ...