Suppose yao + a₁yt-1 + ut, and u₁ = put-1 + et and et is serially uncorrelated with es where st. (a) Show that the contemporaneous exogeneity assumption does not hold (b) Show that the problem in (a) is solved when yt-2 is included in the model

Managerial Economics: Applications, Strategies and Tactics (MindTap Course List)
14th Edition
ISBN:9781305506381
Author:James R. McGuigan, R. Charles Moyer, Frederick H.deB. Harris
Publisher:James R. McGuigan, R. Charles Moyer, Frederick H.deB. Harris
Chapter4A: Problems In Applying The Linear Regression Model
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Suppose yao + a₁yt-1 + ut, and u₁ = put-1 + et and et is serially uncorrelated with es
where st.
(a)
Show that the
contemporaneous
exogeneity assumption does not hold
(b)
Show that the
problem in (a) is solved when yt-2 is included in the model
Transcribed Image Text:Suppose yao + a₁yt-1 + ut, and u₁ = put-1 + et and et is serially uncorrelated with es where st. (a) Show that the contemporaneous exogeneity assumption does not hold (b) Show that the problem in (a) is solved when yt-2 is included in the model
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