Great Depression of the 1930's came from the stock exchange crash on 1929. It was originated with manipulation in stock market and, in that moment, the overvaluation of the stocks, and, possibly, real or fake news that originate a wave of sales that lead to the wall street stock exchange crash and, then, to the 1930s great depression.

That meaning that fall of overvaluated prices, step by step, is the opposite of GD of the 1930s.