If you own some Singapore shares, an emerging markets fund, a U.S. ETF and some bonds, you might think you’re well diversified. But you’re probably not.

It’s important to invest in assets with low correlations. When two assets have a low correlation, they tend to move independently of each other. If they have a negative correlation, it means they usually move in opposite directions. A correlation approaching 1 means they move up or down together. (We wrote about correlation here.)

A well-diversified portfolio will contain a mix of assets with low correlations. That way, when one asset, or market, falls, the other assets will hold steady or move higher to offset any potential (and hopefully temporary) losses.

A look at the historical correlations between different markets and asset classes (like stocks and bonds) shows that, over the long term, this generally works. (Remember, a lower number means the two assets have a lower correlation.) For example, as shown in the table below, over the past 28 years, bonds and the S&P 500 have a correlation of only 0.29. Developed markets (the MSCI EAFE Index) and the MSCI Emerging Markets Index have a correlation of 0.7.

Why an Economic Crisis Will Reveal if You’re Well-Diversified

What happens to correlations when disaster strikes
 
But when there’s a crisis, the usual correlation trends go out the window. Correlations between all markets and asset classes rise sharply, as shown for correlations during the global economic crisis (which we calculate here as November 2007-February 2009). For example, the correlation between bonds and the S&P 500 rose to 0.53. The correlation between developed markets and the MSCI Emerging Markets Index increased to a near-perfect 0.94.

Why an Economic Crisis Will Reveal if You’re Well-Diversified

What this means is that during a financial crisis, most investable assets move in the same direction – that is, down. That’s because fear and uncertainty rule and investors tend to sell everything at the same time – whether it’s bonds or stocks, in developed or emerging markets.

The one asset every portfolio should hold
 
But one investment will do better than most during the next crisis – gold. Gold is great portfolio insurance. It has a very low correlation with all of the world’s major stock markets. In 2008, when the STI fell 49 percent, the S&P 500 dropped 38 percent and the global financial system teetered on the brink of collapse, gold prices climbed 6 percent.

In other words, a well-diversified portfolio should include gold. A good way to add it to your portfolio is to use an ETF, like the SPDR Gold Trust (Singapore Exchange, code: O87).

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Kim is the founder of Stansberry Churchouse Research, a joint venture between two independent financial publishers, Singapore-based Truewealth Publishing, and Hong Kong-based Churchouse Publishing.

Kim has nearly 25 years of experience as a stock analyst, hedge fund manager, political risk consultant, and financial commentator in more than half a dozen emerging and frontier markets.

He’s been quoted in the Economist, The New York Times, the Wall Street Journal, Barron’s, and Bloomberg, and has appeared on Fox Business News, China Central Television, and Bloomberg TV, and has written commentary for the Wall Street Journal, Slate.com, Salon, TheStreet.com, breakingviews.com, and other publications.

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