One of our listeners wrote in to ask why Americans are addicted to tipping and just can't seem to quit. This is a subject near and dear to our hearts: doesn't it seem like we're tipping everywhere these days? It's a also a great behavioral economics question. Tipping is one of those conventions that defies both common sense (why do we tip for some services and not others?) - and the rules of economics (why do most people prefer restaurants that don't include fixed service charges in their prices?).