Abstract Using data on user attributes and interactions from an online dating site, we estimate mate preferences, and use the Gale-Shapley algorithm to predict stable matches. How do we choose when what we want is bad for someone else? Thus, mate preferences, without resort to search frictions, can generate sorting in marriages. But economics is not a perfect science. Written with humour, wisdom and compassion, and investigating the worlds of work, shopping, healthcare, house-buying, online dating, politics and daily life, this brilliant and timely book exposes the true cost of economic thinking, points the way to some compelling alternatives - co-operatives, local currencies, non-Western finance, community - and draws attention to some other, timeless values that few of us have yet forgotten. It is political and far from impartial, and yet its values - ownership, efficiency, cost benefit and self-interest - now threaten to usurp all others. Between studies, he has worked as a financial journalist and tried his hand at running a small business.