"A major boom in real stock prices in the U.S. 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."
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Source : "Speculative bubbles don't just pop - they may deflate and reflate" by Robert J. Shiller, www.theguardian.com. July 19, 2013.