Definition of 'Santa Claus Rally'
A surge in the price of stocks that often occurs in the week between Christmas and New Year's Day. There are numerous explanations for the Santa Claus Rally phenomenon, including tax considerations, happiness around Wall Street, people investing their Christmas bonuses and the fact that the pessimists are usually on vacation this week.
Investopedia Says
Investopedia explains 'Santa Claus Rally'
Many consider the Santa Claus rally to be a result of people buying stocks in anticipation of the rise in stock prices during the month of January, otherwise known as the January effect.

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