Mikusheva, Anna; Sølvsten, Mikkel - In: Quantitative economics : QE ; journal of the … 16 (2025) 2, pp. 367-403
This paper studies linear time‐series regressions with many regressors. Weak exogeneity is the most used identifying … assumption in time series. Weak exogeneity requires the structural error to have zero conditional expectation given present and … past regressor values, allowing errors to correlate with future regressor realizations. We show that weak exogeneity in …