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Question 1 of 15
What is the primary definition of heterogeneous endogeneity as presented in the paper?
A. A situation where an endogenous regressor is endogenous for all subgroups of the data.
B. A case where a potentially endogenous regressor is endogenous for some subgroups of the data but exogenous for others.
C. A scenario where an instrumental variable is weak for all subgroups.
D. A condition where all regressors are exogenous across all subgroups.