Do high price-to-earnings ratios predict faster earnings growth and research intensity?
Core argument: Firms with high price-to-earnings ratios show higher subsequent earnings growth at all horizons, a relationship that holds after controlling for firm-specific risk.
High P/E firms have higher subsequent growth of earnings and earnings/sales. Figure 1 [] plots the 5-year ahead earnings growth against current year P/E as a binned scatterplot. A high P/E ratio today predicts high subsequent earnings growth [even after] controlling for firm-specific risk. About half of the relationship (41% over a 5-year horizon) between earnings growth and P/(E + R&D) is accounted for by higher P/E ratios predicting higher growth in earnings relative to sales as opposed to predicting just higher sales growth. Figure 2 [] shows the underlying binned scatterplot. We use P/(E + R&D) instead of P/E to remove movements in E from the deduction of R&D expenditures. The analysis focuses on manufacturing firms where R&D data is better measured. At all horizons, higher price to earning ratios today predict higher subsequent earnings growth. The predictability of earnings and profitability growth by P/E ratios may be related to firms’ innovation. Among manufacturing firms for whom R&D is reliably reported, high P/E firms have higher R&D intensity (Figure 3). Firms with higher sales have lower sales growth and lower R&D intensity. High sales firms tend to have lower R&D intensity, as shown in Figure 4 []. Larger firms also have lower sales growth, as shown in Figure 5 for all firms and Figure 6 for manufacturing firms [].

