Whether we realise it or not, we all take risks large and small every day. Even the most cautious among us cannot opt out - the question is always which risks to take, not whether to take them at all. What most of us don't know is how to measure those risks and maximise the chances of getting what we want out of life. In An Economist Walks into a Brothel, Allison Schrager equips readers with five principles for dealing with risk, principles used by some of the world's most interesting risk takers.