Irrational Exuberance: Second Edition 
Shiller is one of several well-known economists and pundits who've begun a running dialogue in the last few years around the drawbacks of unchecked free markets. Few writers, though, dissect the phenomenon of bubble behavior as clearly and thoroughly as Shiller does. As with the first edition of his book, Shiller begins this one with reams of quantitative data around the late 1990s stock-market runup. This new edition adds data on real-estate price trends in the early 2000s, and points out the striking parallels between the earlier stock-market boom and bust, and current trends with housing prices in the United States. Shiller actually believes the two phenomena are related; as investors lost confidence in the stock market and moved their money into real estate, one asset class fell while the other rose. According to Shiller's analysis, the pattern is destined to repeat itself.
Aside from the initial data, the real strength of Irrational Exuberance is the straightforward, almost clinical way in which it explains why things happen as they do. The book walks readers through structural reasons for market bubbles, then ventures into "softer" analyses which professional economists less confident than Shiller would be scared to touch. It examines cultural factors behind market bubbles, such as hype-mongering news media, and psychological factors, such as herd behavior.
Another improvement in this latest edition of Shiller's book is his inclusion of more personal commentary, and he mentions the influence that his wife, herself a clinical psychologist, has had on his intellectual development and his view of psychological impacts on economic behavior. Other personal insights from Shiller center on experiences he had while touring and lecturing around the first book, and some of the most interesting passages are those in which he describes common questions or feedback from his audience, and what he thought in reaction--but didn't voice while on his tour.
In the end, Shiller closes his book with an intriguing set of policy proposals. He argues for a revamping of the U.S. social security system, a new system of house-price insurance for homeowners, and risk reduction through portfolio diversification. Fans of the brainy academic will note with approval that Shiller practices what he preaches: he has begun trying to implement some of his ideas in the real world through two private consulting firms he has founded, Macro Securities Research and Macro Financial. The hope is if Shiller's as correct with this second book as he was with his first, readers will all learn something from these new companies. --Peter Han
Reviews
The combination of mass psychology and market prices is at the core of this book. For bubbles to happen, information flow is the key. Media plays a significant role in disseminating information and bubbles seem to have originated in recorded history after the advent of the print media. In recent times electronic media particularly the television and the internet play a significant role in speeding up bubble formation and also the reversals. Media needs a storyline and this story needs to be continued to retain customers on a daily basis. Stock market is the ideal place that offers an opportunity to try one's luck if a casino is far away. Backed by on-line dedicated news channels and internet trading, well, it is not surprising that we have day traders in herds. In such situations fundamentals like industry analysis and P/E ratios take a backseat as explained by the author. Historical averages are breached and a euphoria of "once in a life time opportunity" prevails. What happens to the Efficient Markets Theory in such situations?. Since this theory says that markets are perfectly priced based on all publicly available information there cannot be a situation of either under pricing or over pricing. This book perfectly challenges the efficiency and accuracy of this theory.
It is unfortunate that substantial amounts of investments meant to be otherwise risk free sources of income, pension funds for example, are getting diverted into risky markets. Here the author has come out with a list of some sound proposals to protect hard earned life long savings of innocent citizens who are exposed to the irrationality of markets.
The bubble in the housing market is also discussed well. Housing seems to be isolated bubbles occurring in specific regions and not a global phenomenon. But nevertheless the damage can be the same. The party of low interest rate regime seems to be over and a spike in mortgage rates is sure to be the needle that will prick right through this big speculative bubble.
What goes up has to come down ! But once you start reading this book, it is difficult to put it down. Intellectually stimulating and bound to be economically rewarding.