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JEL classification: C68 D9 E62 H5 H6 H55 Keywords:Computable general equilibrium (CGE) model Overlapping generations (OLG) Aging Immigration a b s t r a c t Shimasawa, Manabu, and Oguro, Kazumasa-Impact of immigration on the Japanese economy: A multi-country simulation modelTo quantify the impacts of immigration and fiscal reconstruction on the Japanese economy, we present a dynamic computable general equilibrium OLG model with an overlapping generations structure. We use a total of 16 countries and regions, both including those that are industrialized, such as Japan, the US, and the EU, and developing countries, such as China, Brazil, the Philippines, and Peru.Our simulation results show that a permanent immigration flows of 150,000 will improve the Japanese economy and the welfare of current and future generations. On the other hand, a standalone increase in the consumption tax will not improve long-run welfare.The results indicate that substantially increased inflows of working-age immigrants would alleviate the need for future fiscal reform and also help to dramatically reduce the public pension burden on the working generations.

In countries confronting the issue of low fertility, as Japan is, dual trends showing higher regional population density associated with lower fertility rates are being confirmed. It is therefore an important theme for analysis to deepen discussions related to reducing regional fertility disparities by increasing fertility through the implementation of comprehensive childcare support policies, which might facilitate the striking of a balance between child-rearing and work, even in highly populated regions. As described herein, we constructed a simple theoretical two-region Overlapping Generations (OLG) by incorporating migration and land prices. Using it, we analyzed effects of population density and childcare services on fertility. Results elucidated the following three points. First, in the presence of congestion costs associated with increased population density, the fertility rate of the region decreases with increased population density. However, if the time cost of child-rearing is brought down by raising the level of the childcare services provided in the region, then the effect of increased population density on fertility can be restrained. Second, when the effect of population size on productivity is less than a certain level, improvement in the childcare services raises the relative ratio of the population density. When the effect of population size on productivity exceeds a certain level, however, the relative ratio of the population density decreases if the relative ratio of the time cost of child-rearing decreases as a result of childcare service reform. Third, where each region imposes payroll tax on its residents and uses its tax revenue as the financial resources to adopt a decentralized strategy of providing childcare services to its region, the level of childcare services that maximizes the utility of a representative agent in each region is independent of the childcare services of any other region. Therefore, manipulation of the level of childcare services becomes a dominant strategy.