I liked this more as a historical artifact (it is the book form of several lectures Galbraith had made prior to 1960) rather than a treatise on economics. I enjoyed his analysis of the Great Depression and his piece "The Nature of Social Nostalgia."
I also liked this bit; the more things change . . .
"In other cases companies were organized to hold securities in other companies and thus to manufacture more securities to sell to the public. This was true of the great investment trusts. During 1929 one investment house, Goldman, Sachs & Company, organized and sold nearly a billion dollars worth of securities in three interconnected investment trusts--Goldman, Sachs Trading Corporation, Shenandoah Corporation, and the Blue Ridge Corporation. All eventually depreciated virtually to nothing. This was, perhaps, the greatest financial fiasco in our history."
It seems investment houses have long been in the habit of manufacturing investments that "unexpectedly" collapse when the underlying security/mortgage/whatever declines in value.