We study the stock market's reaction to aggregate earnings news. Prior research shows that, for individual firms, stock prices react positively to earnings news but require several quarters to fully reflect the information in earnings. We find a substantially different pattern in aggregate data. First, returns are unrelated to past earnings, suggesting that prices neither underreact nor overreact to aggregate earnings news. Second, aggregate returns correlate negatively with concurrent earnings; over the last 30 years, for example, stock prices increased 5.7% in quarters with negative earnings growth and only 2.1% otherwise. This finding suggests that earnings and discount rates move together over time and provides new evidence that discount-rate shocks explain a significant fraction of aggregate stock returns.

We examine cross-sectional determinants of the informativeness of analyst research, i.e., their effect on security prices, controlling for endogeneity among the factors affecting informativeness. Analyst reports are more informative when the potential brokerage profits are higher (e.g., high trading volume, high volatility, and high institutional ownership) and lower when information processing costs (e.g., more business segments) are high. We also find that the informativeness of analyst research and informativeness of financial statements are complements.