Now, Richard Thaler and Cass Sunstein have updated the book, making use of their experiences in and out of government over the past dozen years as well as an explosion of new research. This final edition offers a wealth of new insights, for both its avowed fans and newcomers, about a wide range of issues that we face in our daily lives -- health, personal finance, climate change, and "sludge" (paperwork and other nuisances we don't want, and that keep us from getting what we do want) -- all while honouring one of the cardinal rules of nudging: make it fun!