Steve Hilton was the man behind David Cameron's push to remake British politics. Things didn't work out so well there. Now he's trying to launch a new political revolution – from sunny California.

A series of academic studies suggest that the wealthy are, to put it bluntly, selfish jerks. It's an easy narrative to swallow — but is it true? A trio of economists set out to test the theory. All it took was a Dutch postal worker's uniform, some envelopes stuffed with cash, and a slight sense of the absurd.