How do key ideas in economics relate to our social interactions? Economist Paul Oyer realized that dating sites are no different than the markets Oyer spends his days studying, inspiring him to publish “Everything I Ever Needed to Know About Economics I Learned from Online Dating.” Oyer discusses how key ideas in economics provide a useful guide to finding a mate, and underlie such varied situations as finding a job, ski resort snow reports, college admissions, and more.