# a. Prove that for the Koyck model, the mean lag is as shown in Eq. (17.4.10). b. If is relatively large, what are its implications?

a. Prove that for the Koyck model, the mean lag is as shown in Eq. (17.4.10).

b. If λ is relatively large, what are its implications?

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**17**Section: Exercise Questions

Problem: 7

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