"Those who controlled private capital largely walked away from the US economy for the entire 1930s, refusing to pump in enough new investment even to replace the machinery and goods-in-process that were consumed during the decade."

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A major boom in real stock prices in the US after Black Tuesday brought them halfway back to 1929 levels by 1930. This was followed by a second crash, another boom from 1932 to 1937, and a third crash. Speculative bubbles do not end like a short story, novel, or play. There is no final denouement that brings all the strands of a narrative into an impressive final conclusion. In the real world, we never know when the story is over.

— Robert J. Shiller