Long-run growth effects of taxation in a non-scale growth model with innovation

In previous studies, taxing income or consumption hinders long-run growth. Incorporating saving and leisure into the non-scale Schumpeterian model of Howitt (1999), we show that the usual growth effects of taxing consumption and labor income do not exist.Scale effects; Taxation; Long-run growth

Subsidies in an R&D growth model with elastic labor

This paper compares different subsidies in an R&D growth model with competitive suppliers of a final good and monopolistic suppliers of intermediate goods. Unlike existing studies with lump-sum taxes and fixed labor, we assume distortionary taxes and elastic labor, finding some new insights. First, subsidizing R&D investment is more effective than subsidizing final output or subsidizing the purchase of intermediate goods in terms of promoting growth. Second, in terms of raising welfare, the R&D subsidy may also be more effective than the other subsidies and all of them are dominated by their mix, but none can achieve the social optimum.

Optimal social security in a dynastic model with investment externalities and endogenous fertility

This paper studies optimal pay-as-you-go social security with positive bequests and endogenous fertility. With an investment externality, a competitive solution without social security su?ers from under-investment in capital and over-reproduction of population. We show that social security can improve welfare by reducing fertility and increasing capital intensity. We also illustrate numerically that a small degree of this externality is enough to justify the observed high ratios of social security spending to GDP.

小規模水供給システムにおける病原細菌の一斉検出法を活用した定量的微生物リスク評価

京都大学新制・課程博士博士(工学)甲第24898号工博第5178号京都大学大学院工学研究科都市環境工学専攻(主査)教授 伊藤 禎彦, 教授 松田 知成, 教授 越後 信哉学位規則第4条第1項該当Doctor of Philosophy (Engineering)Kyoto UniversityDGA