Question: Under what condition does the Two - Stage Least Squares ( SLS ) method equal the Instrumental Variables ( IV ) method? When the explanatory

Under what condition does the Two-Stage Least Squares (SLS) method equal the Instrumental Variables (IV) method?
When the explanatory variable is correlated with the error term
When there are no endogenous variables and no instruments.
When there is one endogenous variable and one instrument.
When there is one exogenous variable and one instrument.

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