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A stock market bubble is a type of economic bubble taking place in stock markets when market participants drive stock prices above their value in relation to some system of stock valuation. Behavioral finance theory attributes stock market bubbles to cognitive biases that lead to groupthink and herd behavior. Bubbles occur not only in real-world markets, with their inherent uncertainty and noise, but also in highly predictable experimental markets. In the laboratory, uncertainty is eliminated and calculating the expected returns should be a simple mathematical exercise, because participants are endowed with assets that are defined to have a finite lifespan and a known probability distribution of dividends . Other theoretical explanations of stock market bubbles have suggested that they are rational, intrinsic, and contagious. Historically, early stock market bubbles and crashes have their roots in financial activities of the 17th-century Dutch Republic, the birthplace of the first formal (official) stock exchange and market in history. The Dutch tulip mania, of the 1630s, is generally considered the world's first recorded speculative bubble (or economic bubble). Two famous early stock market bubbles were the Mississippi Scheme in France and the South Sea bubble in England. Both bubbles came to an abrupt end in 1720, bankrupting thousands of unfortunate investors. Those stories, and many others, are recounted in Charles Mackay's 1841 popular account, "Extraordinary Popular Delusions and the Madness of Crowds". The two most famous bubbles of the twentieth century, the bubble in American stocks in the 1920s just before the Wall Street Crash of 1929 and the following Great Depression, and the Dot-com bubble of the late 1990s, were based on speculative activity surrounding the development of new technologies. The 1920s saw the widespread introduction of a range of technological innovations including radio, automobiles, aviation and the deployment of electrical power grids. The 1990s was the decade when Internet and e-commerce technologies emerged.

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