How large are optimal tariffs? What tariffs would prevail in a worldwide trade war? How costly would be a breakdown of international trade policy cooperation? And what is the scope for future multilateral trade negotiations? I address these and other questions using a unified framework which...

What are the gains from international trade? And how do immigrants influence this process? While economists have considered these questions before, particularly in the context of aggregate trade flows, there has been no work assessing the relation between immigration and international trade in...