Swamy, Paravastu A. V. B.; Tavlas, George S.; Hall, … - In: Econometrics : open access journal 3 (2015) 1, pp. 55-64
The method of instrumental variables (IV) and the generalized method of moments (GMM), and their applications to the … instrumental variables that are both exogenous and relevant. We argue that, in general, such instruments (weak or strong) cannot …