Sway discusses how human decision-making is influenced by hidden psychological factors like loss aversion, diagnosis bias, and commitment. Drawing on research from social psychology and behavioral economics, the book uses stories to show how these factors can lead people to make irrational decisions, such as a student overpaying for a $20 bill or commuters ignoring a free concert. Sway aims to explain these previously inexplicable influences and point the way toward more rational decision-making.