2019 · John C. Bogle / The Bogle eBlog
Rebuilding Faith: Wealth Management in the New Era
In fact, the correlation between the initial yield and subsequent ten-year return of bonds is a healthy 0.91. Not bad, once we realize that perfect correlation is 1.00. The reason for this close correlation is not complicated: If interest rates remain unchanged, of course the returns would be identical. But while rising rates would depress bond prices, the higher reinvestment rate on each year’s interest payment would have a countervailing impact. And vice versa. In mid-1982, the yield on bonds—the Lehman Aggregate Bond Index of U.S. Government and investment-grade corporate bonds—was 14%; during the subsequent decade the annual return on bonds came to 13%, and to 10% over the past two decades. Today, with the bond yield at just over 6%, bond returns in the coming decade should run between, say, 5% and 7%. What we know—or at least can be highly confident about—is that we are looking at future bond returns that are also a pale imitation of those we have enjoyed in recent decades.