Before revision:  In particular, we show how to construct the smallest and largest values of the counterfactual as the distribution of unobservables spans nonparametric neighborhoods of the researcher's assumed specification while other `structural' features of the model , e.g. equilibrium conditions, are maintained.
After revision:  In particular, we show how to construct the smallest and largest values of the counterfactual as the distribution of unobservables spans nonparametric neighborhoods of the researcher's assumed specification while other "structural" features of the model , e.g. equilibrium conditions, are maintained.