Copyright 2018 NPR. To see more, visit RENEE MONTAGNE, HOST: Milk is one of the most popular items in a supermarket. And yet, it is often found at the very back of the store. One theory is that stores want you to walk further through the aisles so you'll buy more stuff. But there's another explanation that's more innocent. David Kestenbaum with our Planet Money team tried to find out which is right. DAVID KESTENBAUM, BYLINE: To lay out the two theories, we have two - I'm going to call them milk theorists. First - food writer Michael Pollan, author, most recently, of "Cooked: A Natural History of Transformation." Michael gets his milk at a small grocery store in Berkeley, California. MICHAEL POLLAN: I get a local milk called san benois which is not homogenized but pasteurized and is whole. KESTENBAUM: Second milk theorist - economist Russ Roberts at the Hoover Institution. He shops at Costco. For the record - not a milk drinker. RUSS ROBERTS: I'm pretty lactose intolerant, so I don't
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