The Definition

A mutual fund is nothing more than a collection of stocks and/or bonds. You can think of a mutual fund as a company that brings together a group of people and invests their money in stocks, bonds, and other securities. Each investor owns shares, which represent a portion of the holdings of the fund.

You can make money from a mutual fund in three ways:

1) Income is earned from dividends on stocks and interest on bonds. A fund pays out nearly all of the income it receives over the year to fund owners in the form of a distribution.

2) If the fund sells securities that have increased in price, the fund has a capital gain. Most funds also pass on these gains to investors in a distribution.

3) If fund holdings increase in price but are not sold by the fund manager, the funds shares increase in price. You can then sell your mutual fund shares for a profit.

Funds will also usually give you a choice either to receive a check for distributions or to reinvest the earnings and get more shares.

Advantages of Mutual Funds

Professional Management The primary advantage of funds is the professional management of your money. Investors purchase funds because they do not have the time or the expertise to manage their own portfolios. A mutual fund is a relatively inexpensive way for a small investor to get a full-time manager to make and monitor investments. (For more reading see Active Management: Is It Working For You? )

Diversification — By owning shares in a mutual fund instead of owning individual stocks or bonds, your risk is spread out. The idea behind diversification is to invest in a large number of assets so that a loss in any particular investment is minimized by gains in others. In other words, the more stocks and bonds you own, the less any one of them can hurt you (think about Enron). Large mutual funds typically own hundreds of different stocks in many different industries. It wouldnt be possible for an investor to build this kind of a portfolio with a small amount of money.

Economies of Scale — Because a mutual fund buys and sells large amounts of securities at a time, its transaction costs are lower than what an individual would pay for securities transactions.

Liquidity — Just like an individual stock, a mutual fund allows you to request that your shares be converted into cash at any time.

Simplicity Buying a mutual fund is easy! Pretty well any bank has its own line of mutual funds, and the minimum investment is small. Most companies also have automatic purchase plans whereby as little as $100 can be invested on a monthly basis.

Disadvantages of Mutual Funds

Professional Management — Many investors debate whether or not the professionals are any better than you or I at picking stocks. Management is by no means infallible, and, even if the fund loses money, the manager still gets paid.

Costs — Creating, distributing, and running a mutual fund is an expensive proposition. Everything from the managers salary to the investors statements cost money. Those expenses are passed on to the investors. Since fees vary widely from fund to fund, failing to pay attention to the fees can have negative long-term consequences. Remember, every dollar spend on fees is a dollar that has no opportunity to grow over time. (Learn how to escape these costs in Stop Paying High Mutual Fund Fees .)

Dilution — Its possible to have too much diversification. Because funds have small holdings in so many different companies, high returns from a few investments often dont make much difference on the overall return. Dilution is also the result of a successful fund getting too big. When money pours into funds that have had strong success, the manager often has trouble finding a good investment for all the new money.

Taxes — When a fund manager sells a security, a capital-gains tax is triggered. Investors who are concerned about the impact of taxes need to keep those concerns in mind when investing in mutual funds. Taxes can be mitigated by investing in tax-sensitive funds or by holding non-tax sensitive mutual fund in a tax-deferred account, such as a 401(k) or IRA .(Learn about one type of tax-deferred fund in Money Market Mutual Funds: A Better Savings Account .)