Recent evidence indicates the value premium declined over time. In this paper, we argue this decline happened because book equity, BE, is no longer a good proxy for fundamental equity, FE, defined as the equity value originating purely from cash flows. Specifically, we estimate FE for public US firms (from 1973 to 2018) and find that the premium associated with the fundamental-to-market ratio, FE/ME, subsumes the BE/ME premium and has been stable while the cross-sectional correlation between FE/ME and BE/ME decreased over time, inducing an apparent decline in the value premium. We also show that FE/ME provides a better value premium signal than several alternative valuation ratios beyond BE/ME.
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