Question: 4 Consider the error correction model in equation (18.37). Show that if you add another lag of the error correction term, yt2 xt2, the
4 Consider the error correction model in equation (18.37). Show that if you add another lag of the error correction term, yt2 xt2, the equation suffers from perfect collinearity. (Hint: Show that yt2 xt2 is a perfect linear function of yt1 xt1, xt1, and yt1.)
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