He has published over 70 theoreticalempiricaland policy papers on international macroeconomic issues and co-authored the books Political Cycles: Theory and Evidence and Bailouts or Bail-ins?
For further information, this video looks at the theoretical case for small government and this video examines the empirical evidence against big government.
As he and other economists acknowledge in a symposium in the July Economic Journal, there is no clear-cut theoretical answer to the question of whether regional trade agreements are good or bad, and the empirical findings are hotly disputed.