Economic models are notoriously poor at forecasting severe downturns.  Here 
are some studies that identify the kind of behavior that suggest that a 
crisis might be around the corner.

Broughton, Philip Delves. 2008. Ahead of the Curve: Two Years at Harvard 
Business School (New York: Penguin Group).

272-3: "The job statistics for our class showed that 42% went into 
financial services, ranging from investment banking to private equity, 
venture capital, and commercial banking.  21% went into consulting.  There 
was then a steep drop to technology and telecommunications, with 6%.  
Pharmaceuticals, consumer products, retail, and other manufacturing each 
drew less than 5%.  Nonprofit and government accounted for less than 5%, 
half of whom were part of an HBS program to place students in nonprofit and 
government jobs and subsidize their salaries to bring them in range of the 
for-profit sector.  80% of the class took jobs in the United States.  The 
total compensation for my class in its first year out was $138,125.  Ray 
Soifer, a graduate of the class of 1965 and a banking analyst, had been 
keeping track of the relationship between the condition of the American 
equity market and the percentage of Harvard MBA graduates choosing careers 
in financial services.  10% or less was a long-term buy signal.  30% or 
more was a long-term sell.  The choices of the class of 2006 told you the 
markets were soon to crash."

Michael Lewis seemed to have stumbled on the model earlier.

Lewis, Michael. 1989. Liar's Poker: Rising Through the Wreckage on Wall 
Street (NY: W.W. Norton).

24: "Forty percent of the thirteen hundred members of Yale's graduating 
class of 1986 applied to one investment bank, First Boston."

Poor, Meredith. 1998. "Twin Towers: Letter to the Editor." Scientific 
American (April).

The skyscrapers of the 1930s (the Chrysler Building and the Empire State 
Building) were built just as the Great Depression took hold of the U.S. 
economy.  The World Trade Center and Sears Tower were also leading 
indicators of the economic malaise of the 1970s.  And just as Malaysia 
completes its showpiece, the Petronas Twin Towers ["The World's Tallest 
Buildings," by Cesar Pelli, Charles Thornton and Leonard Joseph, December 
1997], the economy of the region dives into disaster.  In retrospect, this 
should be no surprise; during these periods, symbolism took great 
precedence over substance.

Soon picked up by Business Week

Koretz, Gene. 1999. "Do Towers Rise Before a Crash?" Business Week (17 
May): p. 26.

Andrew Lawrence of Dresdner Kleinwort Bensen in Hong Kong found a close 
relationship between the construction of grandiose high rise buildings 
(reflecting excessive optimism) and subsequent crashes.


-- 
Michael Perelman
Economics Department
California State University
Chico, CA 95929

Tel. 530-898-5321
E-Mail michael at ecst.csuchico.edu
michaelperelman.wordpress.com
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