%0 Report
        %A Heckman, James J.
%A Urzua, Sergio
        %T Comparing IV with Structural Models: What Simple IV Can and Cannot Identify
        %D 2009
        %8 2009 Jan
        %I Institute of Labor Economics (IZA)
        %C Bonn
        %7 IZA Discussion Paper
        %N 3980
        %U https://www.iza.org/publications/dp3980
        %X 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.
        %K Marschak's Maxim
%K instrumental variables
%K structural approaches