We put forward a model of private goods with externalities. Agents derive benefit from communicating with each other. In order to communicate they need to have a language in common. Learning languages is costly. In this setting no individually rational and feasible Groves mechanism exists. We...

This paper evaluates the welfare effects of the 1986 Tax Reform Act (TRA86). In thirty years since its introduction, several studies have analysed the effects of TRA86. However, preference heterogeneity and non-market dimensions of welfare have not been taken into account. We propose an...