Question: Consider the instrumental variable regression model Y-B+ BX+BW, + , where X, is correlated with u, and Z; is an instrument. Suppose that the first

Consider the instrumental variable regression model Y-B+ BX+BW, + ", where X, is correlated with u, and Z; is an instrument. Suppose that the first three assumptions in Key Concept 12.4 are satisfied. Which IV assumption is not satisfied when:

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