Zit 7 Some argue that GMM regressions suffer from weak instrument problems or parameter identification problems (e.g. Stock and Wright, 2000; Kleibergen and Mavroeidis, 2009; Newey and Windmeijer, 2009). Lubik and Schorfheide (2007:1073) argue that system-based estimation methods, such as the Bayesian approach or the full-information maximum likelihood approach, are superior in dealing with endogeneity identification issues in estimation since it accounts for the endogeneity by adjusting for the non-zero conditional expectation of the monetary policy shock.Bayesian methods, however, may end up covering identification problems if improperly used, in which identification problems emerge because not all the structural parameters are recoverable from the semi-structural ones and the objective functions are poorly behaved (Canova, 2009:311).