Working papers 

• 2026, "Immigration and human capital adjustments: evidence from the 1990 reform of Japan’s immigration act."  (with Jongkwan Lee) Paper

• 2025, "Trade dynamics in sovereign debt crises." (with Tamon Asonuma, Marcos Chamon, and Yasumasa Morito) Paper

• 2025, "The impact of import shocks on internal migration in Japan." (with Masahiro Endoh and Toshiyuki Matsuura) Paper

• 2025, "A disturbed airport and diverted exports: evidence from typhoon Jebi." (with Toshihiro Okubo) Paper

• 2025, "Trade continuity effects of the flexible customs declaration scheme: evidence from two typhoons." (with Shintaro Negishi, Fumiharu Ito, Takanori Otsuka, and Kayo Takama) Paper

• 2025, "Economic, demographic, and fiscal effects of heat shocks." (with Hibiki Ichiue) Paper

• 2025, "Geopolitical risk and corporate behaviors: propagation of shocks through global operations." (with Huu Nhan Duong, Jota Ishikawa, Katsumasa Nishide, and S. Ghon Rhee) Paper

• 2025, "Scale economies in transportation." (with Toshihiro Okubo) Paper

• 2025, "Gender-specific exposure to trade, labor market adjustments, and the family" (with Hiroaki Mori and Kiho Muroga) Paper

• 2024, "A tale of two countries: global value chains, the China trade shock, and labor markets." (with Jaerim Choi and Masahiro Endoh) Paper

• 2024, "Global value chains, domestic value chains, and comparative advantage." (with Toshihiro Okubo) Paper 

• 2023, "Immigration, imports, and (im)mutable Japanese labor markets." (with Yumin Sui and Emily Taguchi) Paper

• 2021, "The effects of trade on the gender gaps: a model-based quantitative investigation." (with Hiroaki Mori) Paper

• 2020, "The impact of global warming on rural-urban migrations: evidence from global big data." (with Giovanni Peri) Paper

Permanent working papers and dormant papers

• 2016, "Spatial income inequality." (solo-authored, dormant)  

Selected work in progress

• "On retailers' behavior in the global and regional economy." (with Ayumu Ken Kikkawa)

English version of articles originally published in Japanese

• 2026, "The three puzzles in the gravity model of international trade."

Keio-IES Discussion Paper Series DP2026-002; the original Japanese version in the Mita Journal of Economics (The Journal of the Keio Economic Society), 117 (2): 231-252, October 2024.

• 2026, "Does international trade raise income? early studies, critiques, and innovations."

Keio-IES Discussion Paper Series DP2026-003; the original Japanese version in the Mita Journal of Economics (The Journal of the Keio Economic Society), 116 (2): 153-185, July 2023.

• 2022, "The empirics of the China trade shock: a summary of estimation methods and a literature review."

Keio-IES Discussion Paper Series DP2022-008; the original Japanese version in the Mita Journal of Economics (The Journal of the Keio Economic Society), 114 (4): 381-419, January 2022.

Akira Sasahara, Faculty of Econonics, Keio University