Using a multisector dynamic spatial integrated assessment model (S-IAM), we argue that a carbon tax introduced by the European Union (EU) and rebated locally can, if not too large, increase the size of Europe’s economy by concentrating economic activity in its high-productivity non-agricultural core and by incentivizing immigration to the EU. The resulting change in the spatial distribution of economic activity improves global efficiency and welfare. A carbon tax introduced by the US generates similar effects. This stands in sharp contrast with standard models that ignore trade and migration in a world shaped by economic geography forces.
