Comparing IV with Structural Models: What Simple IV Can and Cannot Identify
33 Pages Posted: 17 Feb 2009 Last revised: 8 Sep 2010
Date Written: February 2009
This paper compares the economic questions addressed by instrumental variables estimators with those addressed by structural approaches. We discuss Marschak's Maxim: estimators should be selected on the basis of their ability to answer well-posed economic problems with minimal assumptions. A key identifying assumption that allows structural methods to be more informative than IV can be tested with data and does not have to be imposed.
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