COV(AB)
tends to move together (+) move count to each other (-) randomly (0)
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Components of A Stock’s Total Risk
Market, or non-diversifiable, or systematic risk
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Theoretically, it is reasonable to consider the riskness of every security in terms of its contribution to the riskness of portfolio rather than in terms of its riskness if held in isolation.
In general, the risk of a portfolio cannot be diversified completely
For a stock(or a security), its total risk: