Kahneman has performed the historic feat of finding hard evidence for the limits of human reason. With simple but convincing experiments, he has done more to advance psychology as a science than anyone else in a hundred years. The implications for the rationalist ideology behind economics are what led to his Nobel prize, but those implications will probably take a century to work their way into political life, where much of the psychobabble about reason that is used to defend Western political ideals is now revealed as obsolete and scientifically untenable.
Kahneman's book is impressively readable, indeed compelling, and the argument he builds up is as solid as anything in psychology. Using simple questionnaires and elementary statistics, the author reveals facts about Homo sapiens that do more to destroy our self-serving illusions than anything since the breakthrough work on the psychology of religion by William James or the radical exploration of sexuality in the human psyche by Sigmund Freud. In his review of Kahneman's book, Freeman Dyson says Kahneman outranks those thinkers as a scientist. A physicist would say that, but even a lay reader will sense greatness in this book.