Tomohiro Ara

Tomohiro Ara
Associate Professor
Faculty of Economics and Business Administration,
Fukushima University,
Fukushima 960-1296, Japan.
Email:

Research Interests
International Trade, International Economics.

Working Papers

``Trade with Firm-to-Firm Relationships: Identifying New Gains and Losses from Trade.'' September 2025. [PDF] [Slides] [Slides (in Japanese)]
``Global Firms: New Welfare Implications from Importing-Exporting.'' July 2022. New version coming soon! [PDF] [Slides]
``Tariffs on Input Trade Margins under Vertical Oligopoly: Theory and Evidence,'' (joint with Arpita Chatterjee, Arghya Ghosh and Hongyong Zhang), May 2024. New version coming soon! [PDF] [Slides]
``Input Tariff in Oligopoly: Entry, Heterogeneity, and Demand Curvature,'' (joint with Arpita Chatterjee, Arghya Ghosh and Hongyong Zhang), March 2024. [PDF] [Slides]
``Relationship Specificity, Market Thickness and International Trade,'' (joint with Taiji Furusawa), January 2020. [PDF] [Slides]

Work in Progress

``Optimal Input Tariffs.''
``Agglomeration, Vertical Specialization, and the Pattern of Trade.''
``Partial Equity Ownership in International Trade,'' (joint with Arghya Ghosh and Hodaka Morita).

Publications

``Optimal Tariffs in the Melitz Model: A Sufficient Statistics Approach for Trade Policy,'' Japanese Economic Review, forthcoming, June 2025. [PDF] [Slides] [Slides (in Japanese)]
``Two-sided Heterogeneity: New Implications for Input Trade,'' Review of International Economics, 31, 1032-1067, August 2023. [PDF] [Slides] [Link]
``The Margins of Intermediate Goods Trade: Theory and Evidence,'' (joint with Hongyong Zhang), The International Economy, 23, 105-144, December 2020. [PDF] [Slides] [Slides (in Japanese)] [Link]
``Country Size, Technology, and Ricardian Comparative Advantage,'' Review of International Economics, 28, 497-536, May 2020. [PDF] [Slides] [Link]
``Tariffs, Vertical Specialization and Oligopoly,'' (joint with Arghya Ghosh), European Economic Review, 82, 1-23, February 2016. [PDF] [Supplementary Note] [Slides] [Link]
``Global Sourcing in Industry Equilibrium,'' Japanese Economic Review, 65, 93-115, March 2014. [PDF] [Slides (Previous Version)] [Link]

(Last updated: November 11, 2025)