In the case of the simple regression model Yi = ?0 + ?1Xi + ui, i = 1, …, n, when X and u are correlated, then
A) the OLS estimator is biased in small samples only.
B) OLS and TSLS produce the same estimate.
C) X is exogenous.
D) the OLS estimator is inconsistent.
Answer: D) the OLS estimator is inconsistent.
Economics
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