Research

Working Papers

1. "Growth and Welfare Effects of Intervention into Patent Licensing Negotiation" (with Shin Kishimoto), MPRA Paper No. 108009, May 2021.

   • Abstract: Policy makers sometimes intervene in patent licensing negotiations to guide licensing fees, but the impacts of such interventions on economic growth and welfare are relatively unknown. This paper develops a novel Schumpeterian growth model featuring a cooperative game-theoretic framework that describes negotiations about licensing fees. We find that the growth effect of intervention is negative if firms can raise unlimited external funds for their R&D investment. However, when the amount of external funds available is limited, both the growth and the welfare effects of intervention can be positive. This result means that interventions are desirable when the internal funds of firms are the main source of their R&D investment.

2. "Leading Patent Breadth, Endogenous Quality Choice, and Economic Growth" (with Shin Kishimoto), ISER Discussion Paper No.1205, Osaka University, March 2023. Online Appendix (last update: July 11, 2023)

   • Abstract: O'Donoghue and Zweimüller (2004, J. Econ. Growth), a seminal work, showed that broadening leading breadth in patent protection can stimulate innovation. However, the empirical literature has consistently found skeptical results on the positive effect. To fill the gap, we build another framework where the quality improvement size is derived as an interior solution. In our model, broadening leading breadth can negatively affect innovation because each innovator is incentivized to free-ride the other innovators' quality improvements. As a further analysis, we quantitatively investigate the growth effect of intervention in patent licensing negotiation using two different profit division rules derived from a cooperative game. We find that intervention in patent licensing negotiation increases the growth rate and stabilizes the economy.

Presentations in Japan

• 2022

  • Seminar at Osaka Metropolitan University, November 30, 2022. 

  • Sasashima Seminar at Aichi University, July 29, 2022.

  • Japanese Economic Association Spring Meeting (Online) , (Discussant: Tatsuro Iwaisako), May 28, 2022.

• 2021

  • Kyoto University Institute of Economic Research (KIER) Workshop (Online), January 30, 2021.

• 2020

  • Tohoku University Modern Economics Seminar (Online), December 24, 2020.

  • Japanese Economic Association Spring Meeting (Online) , (Discussant: Tatsuro Iwaisako), May 31, 2020.

• 2019

  • Summer Workshop on Economic Theory in Otaru city (Hokkaido), August 8, 2019.

• 2018

  • Japan Economic Association Spring Meeting at University of Hyogo, (Discussant: Yuichi Furukawa), June 10, 2018.

• 2017

  • Industrial Organization Workshop at the University of Tokyo, June 21, 2017.

  • Macroeconomics Seminar at Osaka University, June 9, 2017.

  • Chukyo University Institute of Economics Seminar, May 18, 2017.

  • Tohoku University Modern Economics Seminar, April 27, 2017.

  • Economic Theory and Policy Workshop at Tokyo Metropolitan University (Akihabara Satellite Campus), March 13, 2017.

• 2015

  • Chiba University, June 10, 2015.

• 2014

  • Japanese Economic Association Fall Meeting at Seinan Gakuin University, October 11, 2014.

  • Chiba University, September 10, 2014.

  • The 8th Conference of Macroeconomics for Young Professionals, Osaka (Senri Hankyu Hotel), (Discussant: Tatsuro Iwaisako), March 4, 2014.

• 2013

  • Japanese Economic Association Fall Meeting at Kanagawa University, September 14, 2013.

• 2012

  • Rokko Forum (Kobe University), December 7, 2012.

  • Japanese Economic Association Spring Meeting at Hokkaido University, June 23, 2012.

Referee experience

• International Economic Review, Journal of Economics, Economic Modelling, Singapore Economic Review, The Manchester School