We pay others to take away our household refuse from the front of our house whilst hoarding other junk in the attic. And while most of us wouldn't mind buying other people's discarded clothes in a charity shop, only a few are prepared to take even edible food from supermarket dumpsters. What hidden motives lurk behind our relationship with waste? Martin O'Brien, author of 'A Crisis of Waste?' and Jeff Ferrell, author of 'Empire of Scrounge', join Laurie to sift through the competing ways of understanding refuse.