"Nudge" has transformed the way individuals, companies, and governments view the world—and in the process, it has become one of the most important books of the twenty-first century. This fully updated edition offers a wealth of new insights for book enthusiasts and new readers on COVID-19, nutrition, personal finance, retirement savings, medical care, organ donation, and climate change. Every day we make decisions: about the things we buy or the meals we eat; about the investments we make and the time we spend; about our health and that of the planet. Unfortunately, we often choose poorly. We are all susceptible to biases that can lead us to make bad decisions, making us poorer, less healthy, and less happy. As Richard Thaler and Cass Sunstein show, no choice is ever presented to us in a neutral way. But by understanding how people think, we can make it easier for them to choose what is best for themselves, their families, and society. With brilliant observations and delightful lightness, Thaler and Sunstein demonstrate how to steer us in the right directions without ever limiting our freedom of choice.