Alvin Roth, the Nobel Prize-winning market design and game theory economist at Stanford University and the author of Who Gets What — and Why: The New Economics of Matchmaking and Market Design (Eamon Dolan/Houghton Mifflin Harcourt, 2015), shows how "matching markets" affect us all -- from finding a job or a college -- and how to make better choices as a buyer or a seller in your "marketplace."