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80 Year History: Dividend Yield vs Interest Rates

This essay was originally posted September 3, 2007 at QVMGroup.com.

Just recently there has been renewed ferver in discussions about pricing of risk. Credit yield spreads have been a key focus item. Let's add the spread between domestic stock dividend yield and domestic interest rates to the grist.

The following chart shows the weekly 12-month moving average of the S&P 500 dividend yield, the 3-month Treasury interest rate and the long-term Treasury interest rate (20-Year through 30-Year T-Bond variously — see Data Note below).

A more interesting chart presents the ratio of the S&P dividend yield to the long-term Treasury bond interest rate, as shown below.

Something pretty dramatic happened in the 1950's that inverted the ratio such that equity dividend yields went from greater than long-term government bond interest rates to less than long-term government bond rates.

We don't really know why that happened, but believe it may be an important question. Was the condition before the inversion the "normal" condition, or is the condition since the 1950's "normal"? Is the condition cyclic?

Some cycles are very long. Is this ratio in a long-term cycle? Are the forces that caused the inversion still in effect? Are they diminishing? Could the pre-1950's ratios come back? What could make that happen?

Clearly, the ratio has something to do with pricing of risk. Will the current repricing of risk due to credit problems impact the ratio? Will the decline of the dollar impact the ratio? Will the ascendancies of China and India change the ratio? Will the fact that the U.S. stock market is no longer the majority of world market-cap impact the ratio?

We don't know the answers, but think the question deserves attention in due course. We hope to find a market historian who can shed light on the causes of the 1950's inversion to help us form opinions about the effect of current and evolving conditions.

If pre-1950 conditions come back, there would likely be major adjustments to make in portfolio design.

We see no urgency in resolving these questions, but knowing why things changed and why they might change again could enable seeing far down the road to take positions that would benefit greatly.

Some kinds of market changes are predictable on a long-term basis, slow moving and virtually cannot be stopped, such as the effects of demographic trends. If something of a similar nature explains the equity-to-interest rate ratio, it may be possible to forecast it.

If we can find a market historian to explain the past, we will share the information with our readers.

SPY, VTI and IWB are good domestic equity proxies and TLT is a good proxy for the long-term Treasuries.

Data Note: A widely accepted historical series of long-term Treasury bond yields does not exist. An index must be assembled from the various long-term Treasury rates available over time. Data in this study includes:

  • 1927-1977: Treasury Constant Maturity 20-Year T-Bond Yield
  • 1997-2002: Treasury Constant Maturity 30-Year T-Bond Yield. (The yield curve was flat at the 20-30 year maturity range at the splice date.)
  • 2002-2004: Treasury Constant Maturity 25-Year T-Bond Yield (non-availability of 30-year bonds)
  • 2004-Present: Treasury Constant Maturity series 20-Year T-Bond Yield.

Disclosure: author owns VTI


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