As Russ explains, bond yields may be low, but are still critical as an insurance policy against equity risk.

While growing concerns related to the coronavirus, and its potential impact on global growth, resulted in a nominally negative return for January, U.S. equities remain more than 13% above the Q4 low.

The coronavirus still an unknown and unquantifiable risk, coupled with lingering geopolitical tensions in the Middle East and mounting concerns over the U.S. Democratic Presidential primaries may prompt investors to ask how to best protect their gains. Given a 10-year Treasury yield below 1.60%, bonds may not be the obvious candidate. That said, U.S. Treasuries still look like an effective hedge, which is why investors should maintain a healthy allocation as an insurance policy against equity risk.

Low for very long

Given the magnitude of the four-month stock rally, diminished near-term trade risks and signs of economic stabilization, you would have expected interest rates to back up from their fall lows. Yet, bond yields are virtually unchanged. While interest rates did rise modestly in Q4, rates have fallen substantially in recent weeks. This leaves bond yields just about where they were in early October.

Should stocks continue to rally from here, investors are likely to lose a bit on bonds as interest rates rise to reflect more stable economic prospects. That said, any backup in interest rates is likely to be constrained by the modesty of the expansion and the lack of any pickup in inflation.

Conversely, and the real reason for holding bonds, if stock volatility returns Treasuries are likely to rise and yields will drop even lower. Despite all the anxiety about low bond yields, stock bond correlations remain very negative. In other words, bond prices still tend to rise, and yields fall, when stock prices drop (see Chart 1).

This pattern is also evident when looking at the relationship between stock/bond returns and volatility. Looking back on the post-crisis period, roughly 45% of the variation in stock/bond returns can be explained by weekly changes in equity volatility, as measured by the VIX Index. In weeks when volatility increased, long duration Treasuries typically beat the stock market by roughly 1.5%. When volatility dropped, the relative return reversed, with stocks beating bonds by a similar amount.