The effects of slight changes in the parameters on the characteristic roots of a model (sensitivity analysis) has great potential in econometrics.The author, after suggesting a criterion for giving empirical contents to the notion of "slight", shows how the application of sensitivity analysis to...

A breakdown frontier is the boundary between the set of assumptions which lead to a specific conclusion and those which do not. In a potential outcomes model with a binary treatment, we consider two conclusions: First, that ATE is at least a specific value (e.g., nonnegative) and second that the...