Heterogeneous firm productivity raises the question of whether governments should pursue `pick-the-winner' strategies by subsidizing highly productive firms more, or taxing them less, than their less productive counterparts. We study this issue in a setting where governments can set...

The thesis presents several theoretical models on the causes and consequences of income growth and uncertainty.Part I deals with international trade as a major source of aggregate productivity. It presents the Melitz (2003) model and develops an integrated model of intra-industry trade and...