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...

Voters assign a score to each of the many available alternatives. We study the normativeproperties of procedures that aggregate the scores collected in the ballot box. A vast class ofaggregation procedures, including procedures based on the pairwise comparison of alternatives,satisfy May''s...

Voters assign a score to each of the many available alternatives. We study the normativeproperties of procedures that aggregate the scores collected in the ballot box. A vast class ofaggregation procedures, including procedures based on the pairwise comparison of alternatives,satisfy May''s...