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Oh, and one additional question (for now): if I deal with FE dummy in a regression, how should I properly test for endogeneity and further on if tests confirms it, what then?

Dear all, I am having trouble understanding what happens to fixed effects in GMM estimation. To be more precise, using two approaches: i. equation in differences (IV in levels) - by definition eliminates fixed effects; ii. equation in levels (IV in differences) - what then with FE? Do I need FE dumm...