|Intergenerational issues have become one of the most immediate and important social concerns over recent periods. This project makes both theoretical and empirical analyses of intergenerational issues from an economic point of view. It addresses pension, health care, employment, fertility, child poverty, fiscal deficit, and technological innovation problems in the context of the population aging/decline. It clarifies current and future intergenerational situations of economic well-being, examines cohort-by-cohort motivations to mitigate intergenerational conflicts, deepens conceptual understanding of intergenerational equity, and provides a new analytical framework to overcome a dilemma between equity and efficiency of intertemporal resource allocation. It also conducts several surveys including the Japanese version of health and retirement studies (The 3rd Wave of JSTAR) and the Longitudinal Survey on Employment and Fertility (LOSEF). It will provide solid measures to achieve intergenerational cooperation, as well.