Freakonomics Radio: Why Does Tipping Still Exist?

It's a particularly good episode in general. Of particular interest to me though was all the data shared about Uber--including things like how Uber can proxy ride quality from driver phone data. (Lyft's chief economist, formerly Uber's discusses all this.)

There's a ton of data (and sophisticated color commentary about the restaurant industry) in this episode that elevates it above the often more typical "US tipping sux" commentary.