![Profile Image](https://pbs.twimg.com/profile_images/2044852218/NYT_Twitter_Krugman_normal.png)
Paul Krugman @paulkrugman
It took clever little models of trade with increasing returns and imperfect competition to cut through the fog, to understand key points like the nature of the home market effect, why similar countries trade so much, the role of accident in shaping trade patterns, and more 10/ — PolitiTweet.org