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Systematic risk refers to the portion of risk in a stock that is impossible to avoid, it is also called the market risk, or undiversifiable risk. In the Capital Asset Pricing Model, systematic risk is represented by beta.
Systematic risk is called undiversifiable risk because no matter how many securities are in a portfolio, there will always be some element of risk. This is due to the possibility of macroeconomic factors causing the entire market to decrease in value. Beta is a measure of how sensitive a particular security is to these market conditions. A stock with a high beta is more sensitive to market conditions; and, conversely, a stock with a low beta is less sensitive.
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