Price Informativeness with Equity Market Factors
研究了美国股票中已实现盈余增长的价格信息含量，发现动量因子的超额收益主要来自未来盈余增长，而低贝塔、小盘和盈利因子的超额收益则与盈余关系不大，有助于理解这些市场异象的驱动因素。
Price informativeness measures how and when information is aggregated into asset prices. The authors study the price informativeness of realized earnings growth for US stocks, with a focus on exposures to factors that have historically outperformed the market index. Their study includes the largest 1,000 stocks from 1975 to 2019 and approximately 180,000 individual corporate net income observations aligned by report date. Stock returns are sensitive to concurrent and realized earnings growth reports up to 15 months into the future, but not to old earnings reports. The decomposition of value, momentum, small size, low beta, and profitability factor active returns into components that are explained and unexplained by earnings aids in understanding the anomalous nature of their positive market-relative performance. The active returns to momentum stocks are largely attributable to the growth of realized earnings over the next several quarters. Low beta, small size, and profitability stocks have little of their active returns explained by realized earnings, suggesting the anomalies are associated with other drivers, such as changes in expected long-term earnings growth and discount rates. In contrast, the active returns to value stocks explained by concurrent and future realized earnings are negative.