More generally, the S&P 500 has risen an average of 0.4 percent in weeks after one in which the S&P's expected dividend yield finished above the 10-year yield, over all the weeks going back to 2000. That compares to an average loss of 0.002 percent in the much more frequent weeks in which the 10-year yield recently closed above the expected dividend yield.
This 0.4 percent disparity might not sound like a giant difference, but it does suggest that stocks may be somewhat more attractive when yields on Treasurys are especially low.
From a theoretical perspective, modern investors would generally expect the 10-year yield to be greater than the dividend yield. For those who buy a bond and hold it, the bond yield is the only return that can be achieved. Meanwhile, holders of stocks generally expect the lions' share of their returns to come from capital appreciation. After all, stocks have tended to rise over time.
For those who believe that stocks are set to sink in the near future, however, the comparison between dividend yields and bond yields makes for a poor bull case
"This is the worst possible indicator at this point in time," said Chad Morganlander, portfolio manager at Stifel Nicolaus. "Interest rates are the lowest they've been since the time of Babylon, so using the yield on a 10 year or whatever you want to justify valuations is not prudent."
"What you want to do," Morganlander continued Tuesday on CNBC's "Trading Nation," "is focus your attention on price-to-earnings multiples, operating margins, revenue growth, and watch what global growth is doing."
Seen in that framework, stocks are richly valued even as global growth is poor.
For that reason, "to justify a dividend yield 100 basis points higher than a 10 year is just imprudent. That's like picking up dimes in front of a freight train."