Stellar review of the topic. Detailed and well referenced work that covers a wide ranging topic that spans economics, group dynamics, learning theories and human cognition. From my perspective, the author's use of economic data to test hypotheses is what sets this book apart. It is one thing to run an short term experiment with college students in the psychology lab, it is far more compelling when the hypothesis is tested using data gathered from a series of ongoing human endeavors.
This second edition includes new insights from research conducted since the original book.