Diversification is not only one of the simplest and most logical principles for consistent investment success, but an important one as well. Perhaps this concept is so often overlooked by individual investors because of its simplicity in an otherwise complex world.
The justification for diversification rests partly on the factor of chance and
partly on protection in the event that our analysis, heaven forbid, should
turn out to be incorrect. The purchase of one security or even a portfolio
limited to one asset class runs the risk of exposure to an unforeseen or
unforeseeable event that could cripple an entire investment strategy. It is
certainly true that a portfolio containing 25 stocks will increase the risk that
Diversification is often thought of as a technique for spreading risk, but it
is, in fact, much more than that. Just as it protects against unfortunate
events, diversification can also increase the odds of good fortune. For
example, a portfolio containing 10 or 12 stocks will stand a much better
chance of being affected by a generous takeover offer, an unexpected
technological breakthrough, a big oil strike, or some other beneficial
A further advantage is that diversification allows an
investor to make
gradual changes in a portfolio. For example, market peaks are often
confusing affairs as stocks fluctuate in a wide trading band. One by one,
the indicators fall into place until an overall bearish picture finally becomes
clear. The realization that stocks are in a topping out process is a gradual
The allocation of assets in a number of different categories achieves
diversification, but diversification alone does not necessarily guarantee
investment success. For example, if a portfolio is split evenly between
bonds, stocks, and cash, it could quite easily lose real purchasing value
during a long period of inflation. This would happen because the stock
Why Diversification is Not Always Practiced
Despite the substantial benefits of diversifying, many investors fail to take advantage of this important and profitable technique. The principal reason stems from the frailty of human nature. The first weakness, which many of us would prefer not to admit, is downright laziness. After all, it is much easier to purchase a stock that has just been painted in glowing terms by a broker or friendly “insider,” than to undertake tedious research on a number of different issues from which the final selection will be made.
In a similar vein, many of us are tempted to buy a particular asset theme. “The Fed is pumping up the money supply, OPEC is cutting oil production, and inflation is coming back; so let’s buy precious metals.” This may be perfectly legitimate investment idea, but does it mean that we should allocate all of our assets to vehicles that provide an inflation hedge? Perhaps our assumptions are just plain wrong, or conceivably these possibilities have already been discounted by the market. In either case, this kind of simplistic one-idea allocation strategy leaves no room for error.
Such situations often arise because an individual’s experience and
knowledge are limited. People often extrapolate the failing set of economic
conditions well into the future. The fact that circumstances can and do
change is often ignored or conveniently glossed over. For example, we
may perceive that inflationary conditions are intensifying as a result of the
lagged effect of an easy money policy by the Fed. The decision to buy
Intellectual laziness also applies to an investor who chooses to concentrate on one specific investment, usually a stock, that he hopes will turn out to be his financial home run. As a result, he will have very little, if any, emotional capital left to creatively and objectively examine other possible vehicles. Fear can be just as destructive as greed. When the home run fails to materialize, as is inevitably the case, the investor becomes demoralized. In this kind of emotional state, it will be difficult, if not impossible, to make any rational investment decisions. Performance will suffer and some valuable opportunities will be lost.
Diversification involves a certain degree of patience, thought, and
discipline. Unfortunately, in this day of instant analysis and news, not to
mention unlimited financial leverage, most of us overlook these virtues on
our way to what we (incorrectly) believe to be fast and painless financial
Inflation and Volatility: Two Important Risks
In the final analysis, the two most important risks to a portfolio are
volatility (of the rate of return) and inflation. Experience tells us that over
the long run, equities have offered a better rate of return than either cash or
bonds. However, it is possible to lose a considerable amount of money over
the short term if stocks are bought and sold at the wrong time. Bonds are
also subject to volatility as interest rates rise and fall, but all bonds
By the same token, inflation is a long-term risk because an environment of rising prices eats away at the purchasing value of the principal. The more substantial the holding period, the greater the loss of purchasing power. Diversification is a useful technique for minimizing both risks. For example, if a portfolio always includes some bonds and equities, the holding period of these core positions is, by definition, a lone one, which greatly reduces the volatility risk.
At the same time, part of the portfolio may also be rotated among specific asset classes as the business cycle unfolds. With this combination, the investor can hedge against inflation at that time of the cycle when it is most threatening and offset some of the long-term risk. In this way, diversification is both a static and a dynamic process.
Diversification can also be used to spread risk for shorter-term periods.
For example, you may decide that the outlook for food stocks, in general,
is particularly favorable, especially that of Campbell’s Soup. In this
instance, you are actually making two bets: one for the industry in general
and the other specifically for Campbell’s Soup. It could turn out that you
are correct in you analysis of the food industry, but for some reason,
Campbell’s Soup runs into difficulties of its own and greatly under-performs
other companies in the industry. On the other hand, if you invest in several
food stocks, you are still exposed to the industry risk, but the individual
company risk is spread out among several issues. Under such
circumstances, it is unlikely that this diversification will significantly result
in a much higher reward, but it will certainly limit the downside potential,
i.e., risk for the investor.
Reducing Risk From Individual Companies (Unsystematic Risk)
The approach of diversifying within an industry group can be taken one
step further. We all know that putting your eggs into one basket can lead
to trouble if the basket breaks, so it is important from an investment point
of view to make sure you diversify your portfolio sufficiently in order to avoid
being financially crippled if a specific investment turns bad.
Risk associated with individual companies independent of market fluctuations is called “unsystematic” risk. Experts generally agree that risk declines as more stocks are added to a portfolio, but the marginal beneficial effect significantly diminishes as more issues are added. Figure 1.1 indicates that the most substantial reduction in risk comes at the early stages when the second and third stocks are added. The marginal benefits are progressively reduced. By the time the twelfth stock is added, there is very little in the way of risk reduction to be obtained. The curve clearly shows that the more stocks in a portfolio, the less susceptible that portfolio is to the fortunes of one particular company. The curve starts to flatten out after 6 issues are included. After this point has been reached, the incremental reduction of risk becomes noticeably lower. In effect, there is a great advantage in diversifying between 1 and 12 issues, but not much more from 12, to say, 24. Because it takes a lot longer to research 24 companies than 12 companies, the most efficient approach for most individuals in terms of minimizing risk and effort is to limit the stock portion of their portfolio to around 9 to 12 issues because there is little to be gained from additional diversification.
Excerpted from "All-Season Investor"
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