Aging population causes problem. Immigration solves the problem?
"Kofi Annan calls for UN migration agency," By Peter Deselaers Inter Press Service, November, 2003
Annan's case was strongly backed by Jagdish Bhagwati, professor of economics at Columbia University. Professor Bhagwati first propsed a World Migration Organization (WMO), similar to the World Trade Organization (WTO)or World Health Organization (WHO) about twelve years ago.
It would allow source countries to maintain its citizens loyality and tax their incomes while they work in the host country. Professor Bhagwati discusses his plan in "Borders Beyond Control" (http://bss.sfsu.edu/jmoss/resources/635_pdf/No_35_bhagwati.pdf)
Though Annan does not expect to create a UN migration agency during his term (which ends 2006) eventually "Nation states need to embrace multi-culturalism and deal with their fears about giving up homogeneity and narrow definitions about what constitutes a nationality."
The way I read this World Migration Organization movement we cannot expect "migrants" to help pay our bills.