(This post is a part of the series on Basics of Finance and Investing.)

Merriam-Webster Online Dictionary defines the word security as “the state of being secure”. Then further down, “an instrument of investment in the form of a document (as a stock certificate or bond) providing evidence of its ownership”. These two definitions are not unrelated. A security is an investment instrument that is supposed to secure your financial future.

There are two broad classes of securities, depending on the nature of returns on their investment and the risk involved.

Fixed-income security

A fixed-income security, from its name, pays a fixed periodic return until maturity, when the principal (the amount originally paid to buy the security) is also returned. Fixed-income securities involve very low risk of devaluation/loss of the invested principal. An example is a Money Market instrument such as a Treasury bill.

Variable-income security

A variable-income security, by contrast, is one whose returns as well as the value of the principal vary based on underlying conditions, such as changes in the short-term interest rates. Because the principal itself can go up and down, investing in variable-income securities usually involves considerable risk. Examples include company stocks.

Why should I invest in high-risk assets?

A sensible question. Why? Because it is a fundamental fact of investing that taking more risk will reward you with higher long-term growth of your invested asset. For example, buying a 5-year CD (Certificate of Deposit) – a fixed-income security – at 5% annual interest will guarantee you a risk-free periodic return plus the principal after 5 years. On the other hand, investing in the S&P stock Index fund – a variable-income security with large short-term fluctuations – involves high risk, but your asset would grow at over 10% during most 5-year intervals.

The key phrase here is “long-term” (italicized above). If you want your money quickly, you are better off with low-risk fixed-income type investing. On the other hand, if you can wait several years (the more the better), investing with variable-income securities will smooth out the short-term fluctuations, and get you much higher returns at the end.

We continue with Money Market in the next post.

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