CNBC / BATTLE FOR WORLD - October 3, 2018: The article highlights that the longest bull market in history could be showing worrying echoes of one of the greatest crashes Wall Street has ever seen.

Robert Shiller, professor of economics at Yale University and a Nobel laureate, says the steep run-up in this market rally is similar to the excesses of the 1920s before the October 1929 market crash and Great Depression.

Rapid stock market rises began even earlier. From the beginning of 1928 to Black Thursday on Oct. 24, 1929, the S&P 500 surged nearly 50 percent. Over the next five days, the index plummeted 23 percent. It had reached an all-time high just a month before the crash.

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