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Testing Exogeneity flight controls But when he realised thatThis book discusses the nature of exogeneity a central concept in econometrics and shows how to test for it through numerous substantive empirical examples. Part I considers what exogeneity is and how it can be tested. Part II contains applications to models of expenditure, money demand, inflation, wages and prices, and exchange rates across both developed and developing countries. Part III extends various tests of constancy and forecast accuracy,