of selection) in matching, instrumental variable and control functions methods. (2) It contrasts the roles of exclusion … restrictions in matching and selection models. (3) It characterizes the sensivity of matching to the choice of conditioning …. (4) It demonstrates the problem of choosing the conditioning variables in matching and the failure of conventional model …

nonparametric matching and weighting estimators of the average treatment effects and their properties are examined. …

provide a framework with microeconomic foundations that give rise to matching frictions, which can be used to understand the … indeed, more frequently used aggregate matching technology. Existing differences turn out to be crucial for the empirical …