Hedged Equity vs. Bonds: Seeking A More Reliable Diversifier for Modern Portfolios

Why the 60/40 Portfolio Doesn’t Always Diversify

“Diversification” has been the driving principle of investing and risk management for generations. But what does it mean to be “diversified?”

Merriam-Webster defines “diversified” as “composed of distinct or unlike elements or qualities.” When investing, shorthand for “diversified” is usually a portfolio consisting of 60% US large cap stocks and 40% investment grade bonds, represented by the S&P 500 index and the Bloomberg U.S. Aggregate bond index, respectively.

It is fair to ask- is the 60/40 portfolio really “diversified?” Are U.S. large cap stocks and investment-grade bonds distinct? Do they have “unlike elements or qualities”?

One could argue that yes, equities and bonds are distinctly different investment securities with different return expectations, risks, and claims upon a company’s cash flows. From this perspective, stocks and bonds are obviously different.

However, from a portfolio construction perspective, the answer to the stock-bond diversification question is “sometimes.” Sometimes stocks and bonds behave differently. Sometimes they behave similarly, to the benefit of the investor. Sometimes they behave similarly, to the detriment of the investor.

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