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Suppose you estimate the consumption function: Yi =a1 +a2Xi +u1i and the savings function: Zi =b1 +b2Xi +u2i where Y = consumption, Z = savings,
Suppose you estimate the consumption function:
Yi =a1 +a2Xi +u1i and the savings function:
Zi =b1 +b2Xi +u2i
where Y = consumption, Z = savings, X = income and X = Y + Z.
(i) What is the relationship, if any, between a2 and b2? Show your calculations. (ii) Will the RSS be the same for the two models? Explain.
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