A large empirical literature documents a rise in wage inequality in the American economy. Itis silent on whether the increase in inequality is due to greater heterogeneity in thecomponents of earnings that are predictable by agents or whether it is due to greateruncertainty faced by agents...

This paper extends the widely used ordered choice model by introducing stochasticthresholds and interval-specific outcomes...

This paper presents the econometric approach to causal modeling. It is motivated by policy problems. New causal parameters are defined and identified to address specific policy problems...

This paper begins the synthesis of two currently unrelated literatures: the human capitalapproach to health economics and the economics of cognitive and noncognitive skillformation. ...