We consider a general framework to study the evolution of wage and earnings residuals that incorporates features highlighted by two inf uential but distinct literatures in economics: (i) unobserved skills with changing non-linear pricing functions and (ii) idiosyncratic shocks with both...

Contemporary social teaching suffers from a grave deficiency: it is lacking rules of methodology and procedure suited to social reality that are, in particular, able to reconcile increasing creativity (implying irreversibility) with rationality, which are indispensable for the scientific...

The paper studies the degree of homogeneity of innovative behavior inorder to determine empirically an industry classi¯cation of Dutch manu-facturing that can be used for policy purposes. We use a two-limit tobitmodel with sample selection, which explains the decisions by business en-terprises...