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Shares of stock traded in a stock market. Equities represent the residual claim or interest of the most junior class of investors in assets, after all liabilities are paid.

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Variance attribution calculation from a covariance matrix

Say I have a portfolio with two assets with weights $(x, y)$, and the covariance matrix of the two asset is $((a, r)(r, b))$. Then the total portfolio variance would be $x^2a+2xyr+y^2b$. It is easy to …
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