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Professor Jeffrey Wurgler's co-authored research on investor exuberance is referenced

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Excerpt from The Wall Street Journal -- "Perhaps the most systematic effort to quantify investor exuberance was conducted 20 years ago by Malcolm Baker, a finance professor at Harvard Business School, and Jeffrey Wurgler, a finance professor at New York University.

In research done in the wake of the bursting of the internet-stock bubble, they identified five variables for comparing investor sentiment at different points in time and showing how that relates to stock performance. A composite of those indicators shows that the current market is far less exuberant than in the late 1990s."

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