Stocks, bonds, and cash are the most common asset categories. These are the asset categories you would likely choose from when investing in a retirement savings program or a college savings plan. But other asset categories - including real estate, precious metals and other commodities, and private equity - also exist, and some investors may include these asset categories within a portfolio. Investments in these asset categories typically have category-specific risks. Before you make any investment, you should understand the risks of the investment and make sure the risks are appropriate for you.

Why Asset Allocation Is So Important

By including asset categories with investment returns that move up and down under different market conditions within a portfolio, an investor can protect against significant losses. Historically, the returns of the three major asset categories have not moved up and down at the same time. Market conditions that cause one asset category to do well often cause another asset category to have average or poor returns. By investing in more than one asset category, you'll reduce the risk that you'll lose money and your portfolio's overall investment returns will have a smoother ride. If one asset category's investment return falls, you'll be in a position to counteract your losses in that asset category with better investment returns in another asset category.

The Magic of Diversification. The practice of spreading money among different investments to reduce risk is known as diversification. By picking the right group of investments, you may be able to limit your losses and reduce the fluctuations of investment returns without sacrificing too much potential gain.