Junji Kageyama is a Professor of Economics at Meikai University. He received his Ph.D. in economics from Osaka University and served as a visiting scholar at the Max Planck Institute for Demographic Research, the Vienna Institute of Demography, and the Department of Demography at the University of California, Berkeley. His research interests lie in the areas of demography, behavioral economics, subjective well-being, and bioeconomics, with a current focus on introducing happiness studies into demography and economics. His published research includes analyses of savings and lifespan, time discounting behavior, happiness and life expectancy, the financial burden of children, and the age-trajectories of dissatisfaction and preferences. He is also a member of the editorial board of the Journal of Population Studies.Eriko Teramura is a professor at Meikai University in Japan. She received her Ph.D. in Social Sciences from Ochanomizu University. Her areas of expertise are human resource management, labor economics, and gender studies. Her experience in the private sector has given her a unique perspective regarding family dynamics, demographics, and corporate labor issues. Her main interest is in examining gender disparity within the private sector. In addition to this book, she has co-authored “Wellbeing and policy in Japan,” Briguglio M., et.al (ed.) "Wellbeing and Policy: Evidence for Action"(2023 (in press), Routledge), and other Japanese books such as "Women's work and Japanese workplaces: workplace atmosphere and women's work styles after the Equal Employment Opportunity Law"(2022, Koyo Shobo).