There are many factors that influence our decisions without even our realizing it. In this book, Thaler and Sunstein analyze the decision-making process, the human tendencies that impede the process, the factors that influence them and ways to help people make better decisions. It's a fairly simple concept that is well demonstrated through concrete examples and applications. The injection of humour makes this rather dry material quite palatable.
For me, the theory was much more interesting than the practice and it was easy for me to relate to the various situations presented. I do not agree with their idea of privatizing marriage - their paradigms are limited to their construction, although I'm sure that presented with different arguments, the theory would uphold. Very American-centric, but interesting nonetheless.