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Assuming that you have an IV regression model with 1 instrument currently, but have multiple possible other variables to be used instruments for the same
Assuming that you have an IV regression model with 1 instrument currently, but have multiple possible other variables to be used instruments for the same varible. Discuss the advantage of using all of the all the variables as instruments for the one varibale and describe mathematically the procedure known as two stages least squares (2SLS).
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