An economic bubble occurs when speculation in a commodity causes the price to increase, thus producing more speculation. The price of the good then reaches absurd levels and the bubble is usually followed by a sudden drop in prices, known as a "crash" or a "bubble burst." Economic bubbles are generally considered to have a negative impact on the economy because they cause misallocation of resources into non-optimal uses. In addition, the crash which follows an economic bubble can destroy a large amount of wealth and cause continuing economic malaise as was the case of the Great Depression in the 1930s and Japan in the 1990s. (from Wikipedia)
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