Barriers to international trade are known to be large but due to data limitations it is hard to measure them directly for a large number of countries over many years. To address this problem I derive a micro-founded measure of bilateral trade costs that indirectly infers trade frictions from observable trade data. I show that this trade cost measure is consistent with a broad range of leading trade theories including Ricardian and heterogeneous firms models. In an application I show that U.S. trade costs with major trading partners declined on average by about 40 percent between 1970 and 2000, with Mexico and Canada experiencing the biggest reductions.

What has driven trade booms and trade busts in the past and present? We derive a micro-founded measure of trade frictions from leading trade theories and use it to gauge the importance of bilateral trade costs in determining international trade flows. We construct a new balanced sample of bilateral trade flows for 130 country pairs across the Americas, Asia, Europe, and Oceania for the period from 1870 to 2000 and demonstrate an overriding role for declining trade costs in the pre-World War I trade boom. In contrast, for the post-World War II trade boom we identify changes in output as the dominant force. Finally,

Economists are skeptical about the economic benefits of hosting “mega-events ” such as the Olympic Games or the World Cup, since such activities have considerable cost and seem to yield few tangible benefits. These doubts are rarely shared by policy-makers and the population, who are typically quite enthusiastic about such spectacles. In this paper, we reconcile these positions by examining the economic impact of hosting mega-events like the Olympics; we focus on trade. Using a variety of trade models, we show that hosting a mega-event like the Olympics has a positive impact on national exports. This effect is statistically robust, permanent, and large; trade is around 30 % higher for countries that have hosted the Olympics. Interestingly however, we also find that unsuccessful bids to host the Olympics have a similar positive impact on exports. We conclude that the Olympic effect on trade is attributable to the signal a country sends when bidding to host the games, rather than the act of actually holding a mega-event. We develop a political economy model that formalizes this idea, and derives the conditions under which a signal like this is used by countries wishing to liberalize. JEL classification: F19, L83

ABSTRACT. State capacity matters for growth. I test Bates ’ explanation of pre-colonial African states. He argues that trade across ecological boundaries promoted states. I find that African societies in ecologically diverse environments had more centralized states. This is robust to reverse causation, omitted heterogeneity, and alternative interpretations of the link between diversity and states. Ecological diversity also predicts states outside of Africa. I test mechanisms connecting trade to states, and find that trade supported class stratification between rulers and ruled. I underscore the importance of ethnic institutions and inform our knowledge of the effects of geography and trade on institutions. 1.

In this paper we build into a Ricardian model the role of trade in intermediate inputs, sectoral linkages and differing productivity levels across sectors. The model can be used for both ex-ante and ex-post trade policy evaluation. We also propose a new method to estimate sectoral trade elasticities. Estimation requires only trade and tariff data and does not require the assumption of bilaterally symmetric trade costs. With the model and estimates of sectoral trade elasticities for the year 1993, we evaluate the trade and welfare e¤ects of the North American Free Trade Agreement (NAFTA). We do so by incorporating into the model the change in tariffs from 1993 to 2005 to calculate the implied changes in exports and imports. We compare these calculated changes to their observed counterparts and find that the model matches the observed outcomes well. We find that as a consequence of the tariff reductions, real wages increased in all NAFTA countries. Mexico had the largest gains, while Canada and the United States gained relatively more from trade liberalization against the rest of the world than from trade liberalization within NAFTA over the sample period.

agricultural research centers that receive principal funding from governments, private foundations, and international and regional organizations, most of which are members of the Consultative Group on International Agricultural Research (CGIAR).

What has driven trade booms and trade busts in the past and present? We employ a micro-founded measure of trade frictions consistent with leading trade theories to gauge the importance of bilateral trade costs in determining international trade flows. We construct a new balanced sample of bilateral trade flows for 130 country pairs across the Americas, Asia, Europe, and Oceania for the period from 1870 to 2000 and demonstrate an overriding role for declining trade costs in the pre-World War I trade boom. In contrast, for the post-World War II trade boom we identify changes in output as the dominant force. Finally, the entirety of the interwar trade bust is explained by increases in trade costs.

Any opinions expressed here are those of the author(s) and not those of IZA. Research published in this series may include views on policy, but the institute itself takes no institutional policy positions. The IZA research network is committed to the IZA Guiding Principles of Research Integrity. The Institute for the Study of Labor (IZA) in Bonn is a local and virtual international research center and a place of communication between science, politics and business. IZA is an independent nonprofit organization supported by Deutsche Post Foundation. The center is associated with the University of Bonn and offers a stimulating research environment through its international network, workshops and conferences, data service, project support, research visits and doctoral program. IZA engages in (i) original and internationally competitive research in all fields of labor economics, (ii) development of policy concepts, and (iii) dissemination of research results and concepts to the interested public. IZA Discussion Papers often represent preliminary work and are circulated to encourage discussion. Citation of such a paper should account for its provisional character. A revised version may be available directly from the author. IZA Discussion Paper No. 6941

Models in which growth is driven by innovation naturally lead to scale effects. These scale effects result in the counterfactual prediction that larger countries should be much richer than smaller ones. We explore and quantify two candidates to solve the puzzle: First, countries are not fully isolated from each other; and second, countries are not fully integrated domestically. To such end, we build a quantitative model of trade and multinational production (MP) with frictions to move goods and ideas not only across, but also within countries. The calibrated model goes a long way to resolve the puzzle. The existence of domestic frictions, rather than openness to trade and MP, is what allows the extended model to come close to matching the data.

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