| US housing bubble
US housing bubble' refers to a belief that there is a economic bubble in real estate in the United States. This follows the stock market bubble in the 1990s which was called, among other things, the dot-com bubble. A real estate bubble or property bubble (or housing bubble for residential markets) is a type of economic bubble that occurs periodically in local or global real estate markets. It is characterized by rapid increases in the valuations of real property such as housing until they reach unsustainable levels relative to incomes and other economic indicators, followed by decreases that can result in many owners holding negative equity (a mortgage debt higher than the value of the property). Just like any type of economic bubble, it is difficult to identify except in hindsight, after the crash.
There are several factors believed to explain the US housing bubble. The Economist magazine said that ""the worldwide rise in house prices is the biggest bubble in history"" [1], so any explanation must consider global causes as well as those specific to the United States. US Federal Reserve Chairman Alan Greenspan said in mid-2005 that ""at a minimum, there's a little 'froth' (in the US housing market) … it's hard not to see that there are a lot of local bubbles."" Bubbles may only be positively identified by some in hindsight, after a market correction, and there is debate during the rise in prices about whether this is caused by a mania or sustainable economic reasons such as larger demand due to increased population and liquidity, and limited supply.
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