Question: If the instruments are not exogenous you cannot perform the first stage of 2 SLS . then, in order to conduct proper inference, it is

If the instruments are not exogenous
you cannot perform the first stage of 2SLS.
then, in order to conduct proper inference, it is essential that you use heteroskedasticity robust standard errors.
your estimates have large variances
then the 2SLS estimator is inconsistent.
If the instruments are not exogenous you cannot

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