What tariffs would countries impose if they did not have to fear any retaliation? What would occur if there was a complete breakdown of trade policy cooperation? What would be the outcome if countries engaged in fully efficient trade negotiations? And what would happen to trade policy...

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...

We challenge the conventional wisdom on the variety and productivity gains from trade liberalization which are commonly referred to as "new" gains from trade. In particular, we show that the import variety gains measured in studies such as Broda and Weinstein (2006) are counteracted by exactly...

We examine how deep agreements on domestic regulations affect welfare in a world where such agreements are influenced by producer lobbies. The answer to this question depends in a critical way on whether the agreement focuses on product standards or on production regulations. International...

What tariffs would countries impose if they did not have to fear any retaliation? What would occur if there was a complete breakdown of trade policy cooperation? What would be the outcome if countries engaged in fully efficient trade negotiations? And what would happen to trade policy...

I use a quantitative economic geography model to explore subsidy competition among U.S. states. I ask what motivates state governments to subsidize firm relocations and quantify how strong their incentives are. I also characterize fully non-cooperative and cooperative subsidy choices and assess...

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...