A theory asserting that if the S&P 500 closes positive in the month of January, it will be positive for the remainder of the year. This means that supposedly if the S&P 500 closes negative for the month, it will be down for the remainder of the year as well. This was supported by the Stock Trader's Almanac, which shows that historically, this has been true 90 percent of the time since 1950.

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