Was the collapse of world trade between 1928 and 1937 caused by higher transport costs, increased protectionism or the … equilibrium effects of bilateral distance, international borders, and the payment system on trade. My results suggest that had … average tari and non-tari trade barriers remained at their 1928 level, total international trade would have been 64.6 % higher …

, a three stage IV regression model produces strong support that migration and trade union membership were crucial factors …