Robert James "Bob" Shiller (born Detroit, Michigan,March 29, 1946) is an American economist, academic, and best-selling author. He currently serves as the Arthur M. Okun Professor of Economics at Yale University and is a Fellow at the Yale International Center for Finance, Yale School of Management. Shiller has been a research associate of the National Bureau of Economic Research (NBER) since 1980, was Vice President of the American Economic Association in 2005, and President of the Eastern Economic Association for 2006-2007. He is also the co-founder and chief economist of the investment management firm MacroMarkets LLC.

In this revised, updated, and expanded edition of his New York Times bestseller, Nobel Prize-winning economist Robert Shiller, who warned of both the tech and housing bubbles, now cautions that signs of irrational exuberance among investors have only increased since the 2008-9 financial crisis. With high stock and bond prices in the United States, and rising housing prices in many countries, the post-subprime boom may well turn out to be another illustration of Shiller's influential argument that psychologically driven volatility is an inherent characteristic of all asset markets. In other words, Irrational Exuberance is as relevant as ever.

But Irrational Exuberance is about something far more important than the current situation in any given market because the book explains the forces that move all markets up and down. It shows how investor euphoria can drive asset prices up to dizzying and unsustainable heights, and how, at other times, investor discouragement can push prices down to very low levels.

Previous editions covered the stock and housing markets--and famously predicted their crashes. This new edition expands its coverage to include the bond market, so that the book now addresses all of the major investment markets. This edition also includes updated data throughout, as well as Shiller's 2013 Nobel Prize lecture, which puts the book in broader context.

In addition to diagnosing the causes of asset bubbles, Irrational Exuberance recommends urgent policy changes to lessen their likelihood and severity--and suggests ways that individuals can decrease their risk before the next bubble bursts. No one whose future depends on a retirement account, a house, or other investments can afford not to read it.

For more information, including new developments and regular data updates, please go to www.irrationalexuberance.com