Dr. CHRIS GECZY (Adjunct Professor of Finance, The Wharton School): Because either I have to raise an inordinate amount of capital in order to pay out, or I have to delay or prevent people from taking their money out, which of course induces examination.

NPR: Ponzi Schemes Have Colorful History

Siegel, a well-regarded professor of finance from University of Pennsylvania's Wharton School of Business.

FORBES: A Tree Of Wisdom

"The legislation here imposes a number of liabilities on lenders, " says Jack Guttentag, professor emeritus of finance at the University of Pennsylvania's Wharton School of Business, who writes a nationally syndicated column on mortgages.

FORBES: Congress Lags The Markets On Mortgage Mess

Wachter, professor of real estate and finance at Wharton Business School, also in the US, and joint author of another new study of the crisis.

CNN: Understanding the subprime crunch

Justin Wolfers, assistant professor of business and public policy at the Wharton School at the University of Pennsylvania, where he teaches "Finance, Behavioral Economics and Sports Betting, " says he's very optimistic about betting in office pools.

FORBES: Ten Betting Tips For March Madness

S. Abraham Ravid, a professor of finance at Rutgers University and a visiting professor at the Wharton School of the University of Pennsylvania, looked at nearly 200 films exhibited between late 1991 and early 1993 and concluded that a film's star had no impact on the flick's rate of return.

FORBES: Magazine Article

Dr. Edmans is a finance professor at the University of Pennsylvania's Wharton School, a faculty research fellow of the National Bureau of Economic Research and a research associate of the European Corporate Governance Institute.

WSJ: How to Fix Executive Compensation