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Irrational enthusiasms (some say "exuberance") is something that goes back at least to the dawn of global market economies — I'm thinking here of the 17th-century Dutch speculative trade in tulips, sometimes referred to as tulipomania.
But seldom has a boom-bust cycle has such a well-articulated ideology—captured in texts such as Rhonda Brynes' The Secret, or Esther and Jerry Hick's Ask and It Is Given—as has our recent run-up in uncollateralized derivatives and credit default swaps.
Ehrenreich unpacks the ideology of positive-thinking-lemons-to-lemonade-department-of-silver-linings in this important new book. And Patricia Cohen has shown a bright light on it.
(Full disclosure: Ehrenreich and I are part of an informal working group involved in the critique of improbable thinking.)