Portfolio Rebalancing and the Turn-Of-The-Year Effect
发现1935-1986年间市场风险收益关系不存在一月季节性，差异源于使用市值加权而非等权组合，并支持投资组合再平衡对年初效应的解释。
This paper finds that, for the 1935–1986 period, the market's risk-return relation does not have a January seasonal. The findings differ from those of other studies due to the use of value-weighted, rather than equally weighted, portfolios. Inferences are sensitive to the weighting procedure because of the small-firm return patterns in January. In particular, even in those Januaries for which the market return is negative, small-firm returns are positive, and they are more positive the higher is beta. This is consistent with the portfolio rebalancing explanation of the turn-of-the-year effect.