" We also rewrite potential outcomes with a double indexing notation, where the first index denotes the counterfactual for the instrument and the second index, for the treatment".
It should be "We also rewrite potential outcomes with a double indexing notation, where the second index denotes the counterfactual for the instrument and the first index, for the treatment"
In the LATE section,
It should be "We also rewrite potential outcomes with a double indexing notation, where the second index denotes the counterfactual for the instrument and the first index, for the treatment"