Blending the ingredients of a portfolio
When building portfolios, most investors tend to focus on the appeal of return over risk. But in fact, risk matters as much if not more than return. Ideally, investors want to take <html><body><u>three factors</u></body></html> into account in portfolio construction: the expected return for each asset, the expected risk (normally expressed as the standard deviations of return) and the co-movement of each asset.
For investors using what is known as a formal optimization process, the last two components are represented in what we call a “<html><body><u>co-variance matrix</u></body></html>.” Put simply, it’s a mathematical device for keeping track of multiple columns and rows of numbers. Stripped of the mathematical mysticism, the co-variance matrix drives much of the asset allocation process. While this always serves as a general rule, it is particularly true today given a potential shift in the economic environment. Here are two reasons why:
Risk is stable but not always stationary
Between risk and return, risk is the easier parameter to estimate. While risk does shift over time—technology stocks are less volatile than they were back in the late 1990s—most of the time the riskiness of an asset tends to move slowly. That said, risk is not totally static. For example, last summer utility stocks lived up to their reputation as a low <html><body><u>beta</u></body></html>, low volatility sector. The 30-day trailing volatility for the S&P 500 Utilities Sector was between 8% and 9%, well below the broader market (source: Bloomberg). However, an interesting thing happened as the market rallied in the fall: the sector’s volatility rose. By December the annualized volatility for large-cap U.S. utility companies had risen to approximately 12% (see the accompanying chart). What accounted for the rise? Most likely it was the near doubling of interest rates, which tend to disproportionately impact those sectors, such as utilities, owned primarily for their dividend yield.
<html><body><img alt="chart-utilities-sector-v2" class="size-full wp-image-33569 alignnone" height="481" src="http://hvst.co/2lBAik0" width="662"/></body></html>
Even if you were able to forecast both return and risk with perfect precision, there would still be a missing element: <html><body><u>correlation</u></body></html>. Assume two assets, each with identical return and risk, the co-variance matrix would lead you to favor the asset class that is less correlated with the rest of the portfolio. People often underestimate this effect. Even for potentially low return assets, like <html><body><u>gold</u></body></html>, allocations can be high if you expect low or a negative correlation with other assets. The challenge is, as with risk, correlations shift. As I discussed in <html><body><u>a previous blog</u></body></html>, if correlations between stocks and bonds remain negative, as they have for most of the post-crisis period, bonds remain an effective hedge of equity risk. To the extent correlations rise as monetary conditions normalize, with all else being equal, that would suggest a more modest allocation to traditional fixed income, even if return expectations remain constant.
The bottom line: A shifting economic environment, admittedly still a big if, impacts more than just returns. It will also lead to shifts in risk and correlations. Investors should spend as much time contemplating the latter as the former.
<html><body><em><u>Russ Koesterich</u></em></body></html>, CFA, is Portfolio Manager for <html><body><i><u>BlackRock’s Global Allocation</u></i></body></html> team and is a regular contributor to <html><body><em><u>The Blog</u></em></body></html>.Investing involves risks, including possible loss of principal. Past performance is no guarantee of future results. This material is not intended to be relied upon as a forecast, research or investment advice, and is not a recommendation, offer or solicitation to buy or sell any securities or to adopt any investment strategy. The opinions expressed are as of March 2017 and may change as subsequent conditions vary. The information and opinions contained in this post are derived from proprietary and nonproprietary sources deemed by BlackRock to be reliable, are not necessarily all-inclusive and are not guaranteed as to accuracy. As such, no warranty of accuracy or reliability is given and no responsibility arising in any other way for errors and omissions (including responsibility to any person by reason of negligence) is accepted by BlackRock, its officers, employees or agents. This post may contain “forward-looking” information that is not purely historical in nature. Such information may include, among other things, projections and forecasts. There is no guarantee that any forecasts made will come to pass. Reliance upon information in this post is at the sole discretion of the reader. Past performance is no guarantee of future results. ©2017 BlackRock, Inc. All rights reserved. BLACKROCK is a registered trademark of BlackRock, Inc., or its subsidiaries in the United States and elsewhere. All other marks are the property of their respective owners. USR-11763 http://hvst.co/2lBrdb9
Originally Published at: Blending the ingredients of a portfolio