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Consider the linear regression model where is an endogenous regressor. Using a valid instrumental variable for , the first-stage regression of 2SLS is a. on

Consider the linear regression model where is an endogenous regressor. Using a valid instrumental variable for , the first-stage regression of 2SLS is a. on 1 and . b. on 1 and . C. on 1, , and . d. on 1 and

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