How much of corporate profit growth came from lower rates and taxes?
Core argument: Declining interest and corporate tax rates accounted for over 40% of the growth in real corporate profits from 1989 to 2019, while falling risk-free rates explain the entirety of the expansion in price-to-earnings multiples.
The reduction in interest and corporate tax rates was responsible for over 40% of the growth in real corporate profits from 1989 to 2019. Moreover, the decline in risk-free rates over this period explains the entirety of the expansion in price-to-earnings (P/E) multiples. These two factors therefore account for the majority of this period’s exceptional stock market performance. From 1989 to 2019, real corporate profits grew at the robust rate of 3.8% per year. This was almost double the pace seen from 1962 to 1989. The difference in profit growth between these two periods is entirely due to the decline in interest and corporate tax rates from 1989 to 2019. One way to see this is to compare the growth of earnings before subtracting interest and tax expenses (EBIT). In fact, real EBIT growth was slightly lower from 1989 to 2019 compared to 1962 to 1989: 2.2% versus 2.4% per year. The outlook for stock price growth is bleak.





