systematic risk

systematic risk　系统性风险，系统风险　

1.in finance and economics，systematic risk（sometimes called aggregate risk，market risk，or undiversifiable risk）is vulnerability to events which affect aggregate outcomes such as broad market returns，total economy-wide resource holdings，or aggregate income.2.probability of loss common to all businesses and investment opportunities and inherent in all dealings in a market.Also called market risk，it cannot be circumvented or eliminated by portfolio diversification but may be reduced by hedging.In stock markets，systemic risk is measured by beta-coefficient.