In economically developed countries, aging of the population with fewer children is progressing. Social security benefits such as pensions and elderly care are increasing. In a society with fewer children, it is difficult for a government to provide sufficient pension benefits for older people...

Some economically developed countries are suffering from an aging society with fewer children, which has brought about greater burdens imposed by social security. A child allowance and child-care services are provided by the governments in these countries to raise fertility. An increase in...