This study focuses on the semiparametric efficient estimation of random effect panel models containing AR(1) disturbances. We also consider such estimators when the effects and regressors are correlated.

This paper discusses statistical procedures for testing various restrictions in the context of nonparametric models of technical efficiency. In particular, tests for whether inputs or outputs are irrelevant, as well as tests of whether inputs or outputs may be aggregated are formulated.

Several recent papers in the American Economic Review examined important questions regarding productivity growth and its sources in industrialized countries. We examine two sets of issues raised by these papers, and reassess what can be learned about productivity, efficiency, and technology from...