1. Financial Concepts: Introduction
  2. Financial Concepts: The Risk/Return Tradeoff
  3. Financial Concepts: Diversification
  4. Financial Concepts: Dollar Cost Averaging
  5. Financial Concepts: Asset Allocation
  6. Financial Concepts: Random Walk Theory
  7. Financial Concepts: Efficient Market Hypothesis
  8. Financial Concepts: The Optimal Portfolio
  9. Financial Concepts: Capital Asset Pricing Model (CAPM)
  10. Financial Concepts: Conclusion


Many individual investors can't tolerate the short-term fluctuations in the stock market. Diversifying your portfolio is the best way to smooth out the ride.

Diversification is a risk-management technique that mixes a wide variety of investments within a portfolio in order to minimize the impact that any one security will have on the overall performance of the portfolio. Diversification lowers the risk of your portfolio. Academics have complex formulas to demonstrate how this works, but we can explain it clearly with an example:

Suppose that you live on an island where the entire economy consists of only two companies: one sells umbrellas while the other sells sunscreen. If you invest your entire portfolio in the company that sells umbrellas, you'll have strong performance during the rainy season, but poor performance when it's sunny outside. The reverse occurs with the sunscreen company, the alternative investment; your portfolio will be high performance when the sun is out, but it will tank when the clouds roll in. Chances are you'd rather have constant, steady returns. The solution is to invest 50% in one company and 50% in the other. Because you have diversified your portfolio, you will get decent performance year round instead of having either excellent or terrible performance depending on the season. There are three main practices that can help you ensure the best diversification:

  1. Spread your portfolio among multiple investment vehicles such as cash, stocks, bonds, mutual funds and perhaps even some real estate.
  2. Vary the risk in your securities. You're not restricted to choosing only blue chip stocks. In fact, it would be wise to pick investments with varied risk levels; this will ensure that large losses are offset by other areas.
  3. Vary your securities by industry. This will minimize the impact of industry-specific risks.


Diversification is the most important component in helping you reach your long-range financial goals while minimizing your risk. At the same time, diversification is not an ironclad guarantee against loss. No matter how much diversification you employ, investing involves taking on some risk.

Another question that frequently baffles investors is how many stocks should be bought in order to reach optimal diversification. According to portfolio theorists, adding about 20 securities to your portfolio reduces almost all of the individual security risk involved. This assumes that you buy stocks of different sizes from various industries.

Financial Concepts: Dollar Cost Averaging

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