Interest Rates and the U.S. Stock Market: What's the Real Relationship?
Correlations can be a misleading measure of the interaction between economic variables. Here, we take a look at interest rates and the U.S. stock market.
Interest rates and the U.S. stock market: a (slightly) complex interaction
In this post, I’d like to a pick up couple of strands I’ve touched on in the past and tie them together. It’s really another “you can’t always trust correlation” story: this time approached from the perspective of cause-and-effect in the stock market.
Consider the cause-and-effect chains that exist between the economy, interest rates, and the stock market. Economic growth should, in general, be good news for the stock market, and it should also generally mean upward pressure on interest rates. A weak economy should be the opposite.
However, the stock market tends to welcome news of a cut in rates, and dislike increases.
This creates a slightly complex picture as regards the interaction between interest rates and the stock market. On the one hand, the direct connection might be expected to lead to a negative correlation; falling rates being good for markets. On the other hand, the way that the broader economic picture affects each would point to a positive correlation; when the economy is strong, we expect rising rates and strong markets.
In isolation, a rate increase can be seen as bad news for the market, but as a symptom of a strong economy, it can be seen as good news. These relationships aren’t really that confusing, but they become so if we try to reduce them to a single correlation number.
Evidence of the nuanced relationship can be found in historical returns patterns: analysis by my colleagues Bill Madden and Sandy Totten1 found that U.S equities did well when rates rose slowly (i.e. rate less than 1% per year), but not so well when rates rose rapidly (perhaps because rapid increases are often associated with economic distress); meanwhile, when rates fell, U.S. equities did better when they fell rapidly, and not so well when they fell slowly.
Annualized returns on U.S. equities in different interest rate environments
Source: Madden & Totten (2014) When rates rise, do stocks fall? Russell Investments.
All of which is just another reminder that correlations can sometimes be misleading.
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