Should You Add Gold to Your Portfolio?
With the news that gold surged to a new record yesterday, inevitably I'll get questions about adding gold to portfolios. Gold has a low correlation to both stocks and bonds, which is why it can help diversify a portfolio. Today, I'll examine whether gold or a more broadly diversified basket of commodities is a better diversifier.
As I noted in my book The Only Guide You'll Ever Need for the Right Financial Plan, gold has served as a store of value over the very long term, but it has still gone through very long periods where it lost value in real terms. For example, gold traded at $850 per ounce in 1980, then traded at around $900 per ounce at the end of 2009 -- 29 years later. During this time, inflation averaged 3.55 percent per year. To further illustrate this point, at the beginning of 2003 gold was trading at $343 per ounce. From the period of 1970-2002, inflation averaged 3.84 percent per year. For this reason, gold can't be a good inflation hedge except perhaps over an investment horizon far longer than that of the typical investor.
The academic community is split on whether a broadly diversified basket of commodities is a good inflation hedge. On the one hand, Dartmouth professor Ken French argues that commodities (and gold) aren't a good hedge of inflation. On the other hand, Gary Gorton and K. Geert Rouwenhorst argue that commodities can hedge inflation. My position is that a broad basket of commodities provide more inflation protection than gold. Commodities, as an input into production of goods, are a source of inflation, while gold isn't.
A positive note for gold is that it has low correlations with stocks and bonds, so it theoretically should act as a great diversifier. However, the same is true of commodities in general. Kevin Grogan, who co-authored Right Financial Plan with me, examined the impacts of adding gold and adding commodities to a diversified portfolio.
Below are three portfolios*, and their returns 1970 through 2010:
Annualized Return | Standard Deviation | Sharpe Ratio | |
Diversified Portfolio |
11.36% |
12.63% |
0.515 |
Diversified Portfolio with Commodities |
11.32% |
11.79% |
0.541 |
Diversified Portfolio with Gold |
11.29% |
11.71% |
0.541 |
1970-2004 | Annualized Return | Standard Deviation | Sharpe Ratio |
Diversified Portfolio |
12.42% |
11.33% |
0.603 |
Diversified Portfolio with Commodities |
12.39% |
10.39% |
0.647 |
Diversified Portfolio with Gold |
12.22% |
10.45% |
0.626 |
* The diversified portfolio without commodities or gold comprise the following indexes: 7.5% S&P 500 Index, 7.5% CRSP 9-10 Index, 7.5% Fama-French US Small-Cap Value Index, 7.5% Fama-French US Large-Cap Value Index, 15% Fama-French International Value Index, 15% DFA International Small-Cap Index and 40% One-Year US Treasury Note Index.
Portfolios containing commodities or gold are comprised as follows: 7% S&P 500 Index, 7% CRSP 9-10 Index, 7% Fama-French US Small-Cap Value Index, 7% Fama-French US Large-Cap Value Index, 14% Fama-French International Value Index, 14% DFA International Small-Cap Index, 40% One-Year US Treasury Note Index and 4% of either S&P GSCI or the physical returns of gold.
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