Traditional managers strive to beat the market by taking advantage of pricing "mistakes" and attempting to predict the future. Too often, this proves costly and futile. Predictions go awry and managers miss the strong returns that markets provide by holding the wrong stocks at the wrong time. Meanwhile, capital economies thrive—not because markets fail but because they succeed.
Successful investing means not only capturing risks that generate expected return but reducing risks that do not. Avoidable risks include holding too few securities, betting on countries or industries, following market predictions, and speculating on "information" from rating services. To all these, diversification is the antidote. It washes away the random fortunes of individual stocks and positions your portfolio to capture the returns of broad economic forces.
For many investors, the S&P 500 represents the first equity asset class in a diversified portfolio. Although the S&P 500 Index is diversified in large US companies, investors can benefit further by adding components. Take, for example, a portfolio that holds just US stocks (S&P 500 Index), a portfolio that holds just Japanese stocks (MSCI Japan Index), and a portfolio that holds both. The diversified portfolio has not only provided higher historical return than either alone, but it has done so with fewer negative quarters.
Capital markets are composed of many classes of securities, including stocks and bonds, both domestic and international. A group of securities with shared economic traits is commonly referred to as an asset class. There are several asset classes, all with average price movements that are distinct from one another. Investors can benefit by combining the different asset classes in a structured portfolio.
A full range of asset classes includes small and large stocks, domestic and international, value and growth, emerging market countries, global bonds, real estate, and even municipal bonds. Because the asset classes play different roles in a portfolio, the whole is often greater than the sum of its parts. Investors have the ability to achieve greater expected returns with less price fluctuation and more consistency than they would in a less comprehensive approach.