Keyfitz Nathan and Gómez de Leon José. ? Demographic Considerations on Pension-Systems. As populations in developed countries age, the burden of pay-as-you-go pensions is increasing and consideration is again being given to a system of funding, where contributions do not depend on the age...

<DIV>Drawing data from official sources in 60 countries, as well as from the United Nations and the World Bank, this compendium of statistical information on population, fertility, and mortality treats every one of the UN-recognized countries in at least summary form. With data from 1950 onward and...</div>