Bipolar disorder is a psychiatric diagnosis that describes a category of mood disorders defined by the presence of one or more episodes of abnormally elevated mood clinically referred to as mania or, if milder, hypomania. Individuals who experience manic episodes also commonly experience depressive episodes or symptoms, or mixed episodes in which features of both mania and depression are present at the same time. These episodes are usually separated by periods of "normal" mood, but in some individuals, depression and mania may rapidly alternate, known as rapid cycling. Extreme manic episodes can sometimes lead to psychotic symptoms such as delusions and hallucinations.
Source: http://en.wikipedia.org/wiki/Bipolar_disorder
Is the market exhibiting signs of bipolar disorder?
S&P 500 fell from 1300 in early sept to a low to 850 last friday and rose to a high of over 1010 over the short span of 3 trading session.
Is it possible that the 500 largest companies in the US increase in value by over 18%?
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