Kyushu University Academic Staff Educational and Research Activities Database
List of Papers
Kenichiro Ikeshita Last modified date:2024.06.26

Associate Professor / Economic System Analysis / Department of Economic Engineering / Faculty of Economics

1. Kenichiro Ikeshita, Effects of Automation and Human investment on Wage Gap, SSRN, 10.2139/ssrn.4738161, Ikeshita, Kenichiro, Effects of Automation and Human investment on Wage Gap (November 15, 2023). Available at SSRN:, 2024.03, [URL], In many developed countries, economists and policy-makers regarded digitalization and robotic automation as drivers for increasing productivity and achieving economic growth. On the other hand, human resources with IT skills is essential for these technologies. How do the improvement of automation technology and the development of IT human resources affect the wage gap between unskilled and IT skilled workers? This paper combines a task-based approach with a simple two-sector growth model to analyze the impact of automation on wage inequality and economic growth. Our analysis shows that while an increase in the supply of IT-skilled labor reduces the wage gap between these two types of workers, the evolution of automation technology increases the wage gap..
2. Kenichiro Ikeshita, Hideaki Uchida, Tamotsu Nakamura, Automation and Economic Growth in a Task-based Neoclassical Growth Model, Metroeconomica,, 74, 4, 908-927, 2023.04, [URL], This paper incorporates a task-based approach into the Solow growth model to analyze the effects of automation on economic growth. We find that if task producers smoothly adopt automation technology along the capital accumulation path, sustained growth is possible even without technological progress. This result is brought about by the fact that task automation makes the aggregate production function linear. In addition, we demonstrate that both the rental price of capital and the wage are constant on the growth path. In sum, while the interaction between task automation and capital accumulation can be a pathway for sustained growth in output, it leads to the cease of wage growth in the long run..
3. Kenichiro Ikeshita, Effects of Subsidies for Automation on Economic Growth and Factor Prices, Proceedings of 27th Pacific Conference of the RSAI in Kyoto (PRSCO2022), 2022.09, In recent years, while rapid progress in digital technology has made it easier to automate the production process, it has raised concerns that the machines may deprive workers of employment. However, it has not been fully studied how automation-oriented policies affect economic growth. In this paper, we examine the effect of task automation on economic growth and its policy implications by incorporating the task-based approach into the neoclassical growth model. We find that if the number of automated tasks is determined by the firms’ cost minimization behavior, the aggregate production function becomes
asymptotically linear. As a result, a higher subsidy rate for automation raises the rate of return on machinery (capital) and generates perpetual economic growth. On the other hand, both the rental price of capital and the wage converge to their constant values along the equilibrium path. In addition, while an increase in the subsidy rate for automation raises the long-term rental price of capital, it does not affect the long-term wage rate..
4. Kenichiro Ikeshita, Campaign Contributions and Innovation in a Fully-Endogenous Quality-Ladder Model, Asia-Pacific Journal of Regional Science, 10.1007/s41685-018-0080-6, 2, 1, 139-157, 2018.04, This paper examines the effect of campaign contributions on patent policy, welfare, and innovation using a fully-endogenous quality-ladder model. Assuming two types of households, where one type holds patents and the other does not, we analyze political conflicts between the two groups. Our analysis shows campaign contributions increase the rate of innovation to an excessive level from the viewpoint of social welfare when the innovation-maximizing patent policy is sufficiently strong. This result is important because it implies that the rate of innovation distorted by campaign contributions can be too high from the viewpoint of social welfare..
5. Kenichiro Ikeshita, Tamotsu Nakamura, Keisike Osumi, A Phase Diagram Analysis on “The Environment and Directed Technical Change”, Economics Bulletin, 35, 2, 968-977, 2015.04.