One of the biggest benefits of mutual funds is that they provide the means for individual investors to achieve broad diversification in their investment portfolios. Although many wealthy individuals and institutions use mutual funds as at least the core of their portfolios, having considerable wealth is not necessary to construct a well-diversified portfolio with mutual funds. Indeed, it's possible to assemble a well-diversified portfolio of mutual funds with as little as $100,000, a fairly well diversified portfolio with $50,000 and an adequately-diversified portfolio of index funds with much less.
Having a well-diversified portfolio is important for three reasons. First, diversification can best be described as not putting all of your eggs in one basket. Mutual funds are large diversified portfolios and thus provide automatic diversification within their respective asset classes. Investing in a number of mutual funds to spread your investable funds across a variety of asset classes increases your level of diversification and decreases your aggregate exposure to risk. As investment risk is measured in terms of volatility, decreasing aggregate risk decreases the volatility of the value of your portfolio, thus sparing you the roller coaster ride that you would experience if you held only a single asset class in your portfolio, such as large-cap domestic stocks.
Second, although expected return diminishes with risk, the relationship is disproportionate and favors return. Well-conceived diversification has the potential to considerably reduce the aggregate risk of your portfolio at the cost of a relatively small reduction in your expected return. So your get a much smoother ride for a minimal cost.
Third, over the past 25 years or so, there have been a number of studies conducted that have concluded that asset allocation accounts for between 90% and 96% of your success as an investor, where success is defined as maximizing return at a level of risk that is consistent with your level of risk tolerance. Individual security selection accounts for the rest of investors' long-term success. Now, just being broadly diversified won't get you into that 90% to 96% range, but it's a big step in the right direction. A viable model that defines the composition of an efficient portfolio is required to allocate your capital across the various asset classes in a manner that will reap the full benefits of diversification.
Diversification and asset allocation are not synonyms, as diversification is just a part of asset allocation. Diversification is a matter of degree; it describes the degree to which you have diversified away company-specific risk. Full diversification within a market, in theory, eliminates all company-specific risk, leaving your portfolio exposed only to systematic risk, which is the risk inherent in the market as a whole. So, that brings up the obvious question: What is The Market?
The S&P 500, Russell 1000 and Wilshire 5000 are often used as proxies for "The Market." But they're only proxies for the U.S. stock market. To be fully diversified, you would have to be invested in all of the publicly traded securities (stocks, bonds, real estate and commodities) worldwide and your investments would have to be broadly diversified within all asset classes in that aggregation. This can actually be achieved by holding a collection of index funds.
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