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Top 10 rules of portfolio diversification
If there is one thing the 2008 financial meltdown taught us, it is the value of a properly diversified portfolio. The second thing is that if you think you are diversified, you may need to check again. At the time, many thought they were, only to see losses across the board as assets that previously were uncorrelated moved together and sunk many a portfolio.
Today, figuring out what constitutes a diversified portfolio and, more importantly, how to actually assemble one can be a difficult and at times frustrating ordeal; every analyst and investment advisor has a different idea. To help you navigate these treacherous waters, we offer the following 10 rules of portfolio diversification.
1. Start with the end in mind. A diversified portfolio is not a one-size-fits-all product. Instead, it should be personalized, focusing on your personal long-term investment goals while considering your current personal circumstances. According to Michael Loewengart, senior investment strategist at E*TRADE Capital Management, your personal circumstances should take into account your current financial situation, expected future expenses and how far away from retirement you are. "The goal of asset allocation is to make sure the level of volatility in your portfolio is in line with your goals, personal circumstances and tolerance for risk," he says. Additionally, consider your temperament. If high-risk assets make you overly stressed, perhaps it would be better to stick with comparably low-risk alternatives.
2. Aim to reduce overall risk. Portfolio diversification has two goals, this being the first and what most people associate with diversification. If you have multiple assets in your portfolio, even if one is not doing well, you have others that are outperforming. As such, this reduces the overall volatility of the portfolio. "[Diversification] reduces your risk. Instead of being stuck in just one sector that may not do well at times, a diversified portfolio can sustain you and keep you in business," Michael Clarke, CEO of Clarke Capital Management, says.
3. Aim to enhance overall returns. Being able to capitalize in markets that are outperforming and adding to your bottom-line is the second goal of a diverse portfolio. Not only does owning a range of assets protect you in the event that one does poorly, but it positions you to take advantage of ones that perform exemplarily. "We try to have a finger in each of the different sectors because in our experience usually something is working and that one may save the bill," says Clarke.
4. Invest in multiple asset classes. Traditionally, a portfolio was considered diverse if it had a mixture of equities and bonds. As investors are becoming more sophisticated, other assets such as commodities, real estate and foreign currencies are receiving more attention. In order to reduce risk and enhance returns, investments in numerous asset classes help keep correlations among assets in check. Each class has its own drivers and its own speed bumps. Taken together, they help smooth out the ride.
5. Invest in multiple sectors within the asset classes. Just as investing in multiple asset classes reduces risk and enhances returns, so too does investing in multiple sectors within those asset classes. Just including equities, bonds and commodities is not enough as equities have sectors reaching from healthcare to industrial metals, bonds have a variety of maturations and commodities include energies, metals and foods. "You want to be allocated amongst the various market sectors and industries. Across asset classes, you want to have further diversification into the different segments," Loewengart says.
6. Own assets that do well in bull, bear and sideways markets. This point really stresses the need for owning a diverse array of assets. You do not want to place all your eggs in a basket that does well when the stock market is moving up, because that also means your portfolio will do very poorly when that bull market turns into a bear. Instead, it usually is advisable to own assets with a negative correlation in which one asset moves higher while the other moves lower. Examples of this relationship include the U.S. dollar and crude oil as well as stocks and bonds. It is often true that in times of crisis all correlations go to 1.0, but some strategies are more resistant to this. It is wise to look broadly at how various assets perform in different environments.
Commodity Trading Advisor Salem Abraham pointed out following 2008 that nearly all asset classes were long the economy. Managed futures, which are diversified in their own right through being long or short disparate sectors like agriculture, metals, energies, interest rates and currencies, also perform well in periods of high dislocation. Other diversified asset classes had the same negative response to the economic crisis but managed futures did well by taking advantage of fat tail events rather than being punished by them.
7. Have a disciplined plan for portfolio rebalancing. If you have constructed your portfolio properly, it is to be expected that some assets will outperform others and over time begin constituting a larger percentage of your portfolio. That is the time to rebalance and bring your investments back in check with one another. "If you have a disciplined plan for rebalancing in place, then you can capitalize on the different movements that will take place from the different assets in your portfolio," Loewengart says.
He explains that that discipline will enable you to automatically sell out of your outperforming assets and buy into those underperforming. Consequently, you will naturally be selling high and buying low.
8. No "borrowing" among classes except during rebalancing. Trading can become emotional and that can cloud your judgment. It may seem like a good idea to abandon an investment decision that is not immediately paying off or to bolster ones that are doing well. Proceed with caution, because that is a move that catches many investors. The reason for having a rebalancing plan is to remove that emotional element. "When you look at your portfolio, rebalancing with a stated framework is going to give you the discipline that many investors inherently lack," Loewengart says. That discipline helps you do the things that you may not want to do, but are in your best interest.
9. Backtest your portfolio, but consider current market conditions. Backtesting can help you see correlations that exist in your portfolio and can allow you to see how it would stack up in various market conditions. There is a reason, though, that investment advisors are required to say, "Past performance is not indicative of future results." Also, remember there will be periods in the past in which your portfolio would not have fared well.
Past events can provide a framework, but also consider current market conditions to better position your portfolio for future events. We can learn a lot from the past, but current events are shaping
tomorrow’s markets.
10. Test asset correlations periodically. If there is one thing we can count on in the markets, it’s that they will never stay exactly the same. What was negatively correlated one year can move lock-step the next. Consequently, it is not enough to simply rebalance from time to time; you also need to test the asset correlations in your portfolio periodically to see if anything has changed. As markets change, you need to make informed decisions as to how you need to alter your portfolio to counter those changes. You can’t expect your portfolio allocation decisions to be a one-and-done event; as markets change, so to must your portfolio.
These rules leave a lot to personal judgment and that is the key to success. One additional item to point out is that any allocation to a less liquid asset should calculate that liquidity risk in addition to other risks to achieve the proper allocation.
Your portfolio should fit your needs. Unfortunately in the past not all potential asset classes were available to retail investors. Today, thanks to innovative exchange-traded funds (ETFs) and mutual fund structures, nearly every investor can access commodities, currencies, short and leveraged strategies as well as active strategies including managed futures. Now everyone truly can be diversified.
Should You Still Use Commodity to Diversify Investment Portfolio?
A new study from the Bank of International Settlements (BIS) raises doubts about the value of commodities as a tool for enhancing portfolio diversification. The paper’s smoking gun, so to speak, is that “the correlation between commodity and equity returns has substantially increased after the onset of the recent financial crisis.” Some pundits interpret the study as a rationale for avoiding commodities entirely for asset allocation purposes. But that’s too extreme.
In fact, this BIS paper, although worth a careful read, isn’t telling us anything new. That said, it’s a useful reminder for what should have been obvious all along, namely: there are no silver bullets that will lead you, in one fell swoop, to the promised land of portfolio design. The idea that adding commodities (or any other asset class or trading strategy) to an existing portfolio will somehow transform it into a marvel of financial design is doomed to failure. Progress in the art/science of asset allocation arrives incrementally, if at all, once you move beyond the easy and obvious decision to hold a broad mix of the major asset classes.
Correlations are a key factor in the design and management of asset allocation, but they’re not the only factor. And even if we can find assets and strategies with reliably low/negative correlations with, say, equities, that alone isn’t enough, as I discussed last week. You also need to consider other factors, starting with expected return. It may be tempting to focus on one pair of assets and consider how the trailing correlation stacks up today. But that’s hardly the last word on making intelligent decisions on how to build a diversified portfolio.
Perhaps the first rule is to be realistic, which means recognizing that expected correlations, returns and volatility are in constant flux—and not necessarily in our favor, at least not all of the time. Bill Bernstein’s recent e-book (Skating Where the Puck Was: The Correlation Game in a Flat World), which I briefly reviewed a few months ago, warns that the increasing globalization of markets makes it ever more difficult to earn a risk premium at a given level of risk. As “new” asset classes and strategies become popular and accessible, the risk-return profile that looks so attractive on a trailing basis will likely become less so in the future, Bernstein explains. That’s old news, but it’s forever relevant.
As more investors pile into commodities, REITs, hedge funds, and other formerly obscure corners, the historical diversification benefits will likely fade. Granted, the outlook for expected diversification benefits fluctuates through time, and so what looks unattractive today may look considerably more compelling tomorrow (and vice versa). But as a general proposition, it’s reasonable to assume that correlations generally will inch closer to 1.0. That doesn’t mean that diversifying across asset classes is destined to become worthless, but the expected payoff is likely to dim with the passage of time.
The good news is that this future isn't a total loss because holding a broad set of asset classes is only half the battle. Your investment results also rely heavily on how and when you rebalance the mix. Even in a world where correlations are higher and expected returns are lower, there’s going to be a lot of short-term variation on these fronts. In other words, price volatility will remain high, which opens the door (at least in theory) for earning a respectable risk premium.
Still, it’s wise to manage expectations along with assets. Consider how correlations have evolved. To be precise, consider how correlations of risk premia among asset classes compare on a rolling three-year basis over the last 10 years relative to the Global Market Index (GMI), an unmanaged market-weighted portfolio of all the major asset classes. As you can see in the chart below, correlations generally have increased. If you were only looking at this risk metric in isolation, in terms of history, you might ignore the asset classes that are near 1.0 readings, which is to say those with relatively high correlations vis-a-vis GMI. But by that reasoning, you’d ignore foreign stocks from a US-investor perspective, which is almost certainly a mistake as a strategic decision.
Nonetheless, diversifying into foreign equities looks less attractive today compared with, say, 2005. Maybe that inspires a lower allocation. Then again, if there’s a new round of volatility, the opportunity linked with diversifying into foreign markets may look stronger.
The expected advantages (and risk) with rebalancing, in other words, are constantly in flux. The lesson is that looking in the rear-view mirror at correlations, returns, volatility, etc., is only the beginning—not the end—of your analytical travels.
Sure, correlations generally are apt to be higher, which means that it’s going to be somewhat tougher to earn the same return at a comparable level of risk relative to the past. But that doesn’t mean we should abandon certain asset classes. It does mean that we’ll have to work harder to generate the same results.
That’s hardly a new development. In fact, it’s been true all along. As investing becomes increasingly competitive, and more asset classes and strategies become securitized, expected risk premia will likely slide. But what’s true across the sweep of time isn’t necessarily true in every shorter-run period. The combination of asset allocation and rebalancing is still a powerful mix—far more so than either one is by itself. And that’s not likely to change, even in a world of higher correlations.
