Asset Allocation: A Most Important Investment Decision
Sunday, July 1st, 2007Three asset classes - stocks, bonds, and cash make up the investable universe of all assets. How investors choose to allocate their investment dollars across these classes can have a significant impact on the long-term return of an investor’s portfolio. The decision to hold stocks, bonds or cash and in what amounts is believed to account, on average, for the bulk of the variation (risk) in an investor’s return. For a given investor, determination of the optimal mix is what is commonly referred to as an investor’s investment policy or asset allocation policy. It is also known as the asset mix, investment mix, and asset allocation for short.
A capital investment or equity ownership in an entity, commodity or enterprise is represented by holding an ownership certificate, stock. Equity investors earn a return premium that compensates for the perceived level of risk relative to the two other asset classes (bonds and cash). Equity ownership is indefinite, i.e. return of income is uncertain. Bondholders are lenders and they purchase debentures (debt contracts), in the form of bonds, and lend cash for a predetermined period of time. In return for lending their money, bondholders earn a rent, or rate of interest on the principle balance lent. Investors in cash earn the equivalent of a risk-free rate of return on their money. Stock and bond investors typically earn a risk premium, the rate of return above the risk-free rate that an investor demands for assuming risk. The rate of return on a risk-free investment, short-term (overnight) lending, is usually equal to or less than the rate of inflation.
A risk asset is an investment whose real (inflation-adjusted) return and the safe return of principle is uncertain. On the scale of least risky to most risky, cash is least risky and stocks are viewed as most risky. This is because stockholders are second to creditors, lenders of money, in the return of capital. Bondholders get paid before shareholders. As a consequence, shareholders demand higher rates of return to bondholders and bondholders earn higher rates of return to cash investors (who face virtually no insolvency risk). Portfolios made up of different proportions of stocks, bonds and cash will vary in return and risk (defined as the variance in return). There is a tremendous difference between a portfolio whose mix is 80% stocks, 15% bonds, and 5% cash and one whose mix is 60% stocks, 30% bonds, and 10% cash.
Typically, investors are characterized as either passive or active. Passive investors construct their portfolios by buying and holding a collection of randomly selected securities, a diversified portfolio. Investments are purchased with the intention of obtaining long-term appreciation and limiting turnover and maintenance. Passive management is better known as indexing, the designing of a fund to mirror the performance of a published benchmark. Unlike passive management, active portfolio management attempts to add value through one of two active strategies, market timing or security selection. Market timing is an attempt by an investor to benefit from the divergence of the current value of an asset from its “correct” or “rational” level. Security selection attempts to add value by purchasing undervalued (mispriced) securities or emphasizing a group of securities that make up an investment theme, i.e. small capitalization over large capitalization stocks. The objective with active management is to produce better returns than those of passively managed index funds. It has been demonstrated that active management detracts more often than not from overall portfolio performance; that asset allocation plays a more important role in overall portfolio performance.
Over the years, there has been considerable debate as to the importance of an investor’s asset allocation policy. In 1986, Brinson, Hood, and Beebower (BHB)[1], three knowledgeable investment management practitioners, studied the performance of ninety-one large U.S. pension plans over the 1974-1983 period and concluded that “investment policy (asset allocation) dominates investment strategy (market timing and security selection), explaining an average of 93.6% of the variation in total pension plan returns”. Others (most notably Jahnke[2] and more recently Kritzman[3]) have argued that BHB’s original conclusions and methodology are flawed. They contend that too much importance is given to asset allocation; that market timing and security selection have been marginalized.
Without getting into the specifics, Modern Portfolio Theory describes markets as efficient (all publicly available information on an asset is incorporated in the asset’s price nearly instantaneously). If one believes markets are informationally efficient, then it would be difficult to add value from active management. The certainty of market efficiency has been brought into question by some market practitioners, and thus as well, the relevancy of asset allocation. With little uncertainty, suffice it to say that we can probably ascribe efficiency to markets over the intermediate to long-run, which after all is what we should be concerned with as investors. Conventional wisdom accepts that for the “average” investor (especially the unsophisticated investor) it is very difficult to beat the market (earn a rate of return greater than the risk premium associated with an amount of risk). As well, it has been proven, again Modern Portfolio Theory, that in the case of a specific asset class (for instance, stocks), an investor does well to invest in a diversified portfolio.
In my experience, unsophisticated investors (those who do not make a career out of stock picking) are far off better focusing on the asset allocation decision than worrying about which stocks or bonds to hold (security selection) or when to buy them (investment timing). It is clear from financial theory and practical experience that investors’ asset allocation choices should be linked with their specific circumstances or long-term financial goals. Investors determine their asset allocation policy based on their risk tolerance, their financial goals, their time horizon, their non-financial wealth (such as employment income), and the risk premiums of the asset classes.
That is not to say that certain individuals using superior research or first-hand experience cannot take advantage of unique information from time to time through active portfolio management (trading). However, it is likely that the knowledge will become known by the rest of the market, or as well, be in the possession of others, and therefore in the long-run not have any intrinsic value. Only if investors have the ability to predict expected returns in financial markets can tactical (active management) asset allocation enhance portfolio performance. Keep in mind that the degree of skill required to justify an active management strategy is very high. Investing on the basis of event driven information (such as earnings releases or change in corporate control), which may materially impact the value of an enterprise, is likely to be viewed as insider information and construed as illegal.
A better way to consider this issue is to determine whether or not having better information about the asset changes its risk profile and thus the willingness of an investor to assume risk. If so, an investor should be willing to increase such holdings in his/her portfolio. As an investor becomes more knowledgeable about the ownership of equities and more comfortable with their risk, he would then consider increasing his allocation to equities, presuming the allocation meets his risk tolerance.
A passive investment strategy (no trading) with rebalancing (resetting the asset mix to meet your specific circumstances related to return objectives and risk tolerances) is likely to incur lower costs to manage than active portfolio management (buying and selling assets based upon market timing and security selection). The BHB study found that, on average, tactical asset allocation (market timing) and security selection work to detract 1.1 percentage points from the return that would have been achieved with strategic asset allocation (a passive investment strategy) alone. Depending upon one’s time, commitment, and experience, he/she might be better off creating a diversified portfolio of stocks or bonds by choosing to use exchange traded funds (ETFs) encompassing a basket of assets that replicate a “market” portfolio.
In the BHB study, it was found that a portfolio’s asset allocation policy dominates portfolio performance, and over a period of time typically explains over 90 percent of the variation in the portfolio’s returns. However, that is not to say that within a given portfolio’s return, active management did not play a role in imparting a return that varied significantly from a portfolio benchmark. The average ten-year annual return of the 91 actual portfolios was 9.01% and ranged from 5.85 percent to 13.4 percent. Portfolios yielding returns in excess of the average in all likelihood may have been attributed to superior skill or knowledge. As well, they were likely to have been far and few between; the exception. In the long-run, due to competitive forces, the benefit of skill and predictability will average out - losing as often as winning and reverting returns to the mean. Financial theory and empirical evidence show that exposure to systematic risk (market risk) is compensated over time. Active management risk is not compensated on average (Sharpe, 1991)[4]; however, it is compensated if skill overcomes the higher cost hurdle of active management. Active management creates opportunity to outperform. However, the most important consideration is how much extra return active management can add without exposing the portfolio to unwarranted risk. Overcoming the higher cost hurdle of active management is a challenge.
As L. Randolph Hood, the “H” in BHB, stated in a letter to the Financial Analysts Journal 20 years hence first publishing their findings in 1986, “Our message today remains the same as before: Carefully consider what goal you are trying to achieve, how important it is to achieve it, and how much risk you are willing to tolerate in pursuing it. Then, create a policy portfolio (a portfolio allocated to the three major asset classes - stocks, bonds, and cash) that reflects that goal and your risk tolerance for probable outcomes - because executing that policy will have a dominant effect on your success.”[5] Investment policy (the asset allocation decision) should be addressed carefully and systematically.
[1] Brinson, Gary, Randolph Hood, and Gilbert Beebower. “Determinants of Portfolio Performance.” Financial Analysts Journal, July-August 1986, pp. 39-44.
[2] Jahnke, William. “The Asset Allocation Hoax.” Journal of Financial Planning, February 1997, pp. 109-113.
[3] Kritzman, Mark. “Determinants of Portfolio Performance-20 Years Later”: A Comment. Financial Analysts Journal. January/February 2006, Vol. 62, No. 1: 10-11.
[4] Sharpe, William F., 1991. “The Arithmetic of Active Management.” Financial Analysts Journal 47 (1): 7-9.
[5] Hood, L. Randolph, CFA. “Determinants of Portfolio Performance - 20 Years Later.” Author’s Response. Financial Analysts Journal. September/October 2005, Vol 62.
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