The January effect is a hypothesis that there is a seasonal anomaly in the financial market where securities' prices increase in the month of January more than in any other month. This calendar effect would create an opportunity for investors to buy stocks for lower prices before January and sell them after their value increases. As with all calendar effects, if true, it would suggest that the market is not efficient, as market efficiency would suggest that this effect should disappear.
The effect was first observed around 1942 by investment banker Sidney B. Wachtel.[1] He noted that since 1925 small stocks had outperformed the broader market in the month of January, with most of the disparity occurring before the middle of the month.[2] It has also been noted that when combined with the four-year US presidential cycle, historically the largest January effect occurs in year three of a president's term.[3]
The most common theory explaining this phenomenon is that individual investors, who are income tax-sensitive and who disproportionately hold small stocks, sell stocks for tax reasons at year end (such as to claim a capital loss) and reinvest after the first of the year. Another cause is the payment of year-end bonuses in January. Some of this bonus money is used to purchase stocks, driving up prices. The January effect does not always materialize; for example, small stocks underperformed large stocks in 1982, 1987, 1989 and 1990.[4][5]
^"Sidney B. Wachtel; Investment Banker". The Washington Post. October 3, 2008.
^Keim, Donald B.: Size-Related Anomalies and Stock Return Seasonality: Further Empirical Evidence, Journal of Financial Economics 12 (1983)
^"Politics and Profit". November 14, 2012.
^Siegel, Jeremy J.: Stocks for the Long Run (Irwin, 1994) pp. 267–274
^Ciccone, Stephen J. (January 18, 2013). "January's Stock Temptation". The New York Times.
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