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Consider the linear model y = XB + u with classical assumptions (Al)-(A5) being satisfied. Let 1 2 X = n (a) Prove that _

Consider the linear model y = XB + u with classical assumptions (Al)-(A5) being satisfied. Let 1 2 X = n (a) Prove that _ X'X does not converge to a positive definite matrix. (b) Show that (X'X) - 0. What are the implications for OLS

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