There’s nothing controversial about the claim— reported on by Slate, Bloomberg and Harvard Magazine — that in the last 20 years Wall Street has moved away from an investment-led model, to a gambling-led model.
This was exemplified by the failure of LTCM which blew up unsuccessfully making huge interest rate bets for tiny profits, or “picking up nickels in front of a streamroller”, and by Jon Corzine’s MF Global doing practically the same thing with European debt (while at the same time stealing from clients).
As Nassim Taleb described in The Black Swan these kinds of trades — betting large amounts for small frequent profits — is extremely fragile because eventually (and probably sooner in the real world than in a model) losses will happen (and of course if you are betting big, losses will be big). If you are running your business on the basis of leverage, this is especially dangerous, because facing a margin call or a downgrade you may be left in a fire sale to raise collateral.
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