Professor Horowitz correctly identifies the limitation of my assuming separable utility functions to derive a marginal condition for efficiency under uncertainty. Correction this limitation, he provides a simple but powerful condition that encompasses the nonseparable as well as the separable...

Dorfman (1973) anticipates increases in international trade when pollution abatement reduces damage to polluted industries. We simulate the effect of abatement with a Heckscher-Ohlin-Samuelson model of a production on production externality. Both countries are Pigouvian and two levels of...