Interesting article by David Goodhart that looks at the economic benefits of immigration. It includes the following:
Supporters of large-scale immigration now focus on the quantifiable economic benefits, appealing to the self-interest rather than the idealism of the host population. While it is true that some immigration is beneficial - neither the NHS nor the building industry could survive without it - many of the claimed benefits of mass immigration are challenged by economists such as Adair Turner and Richard Layard. It is clear, for example, that immigration is no long-term solution to an ageing population for the simple reason that immigrants grow old, too. Keeping the current age structure constant over the next 50 years, and assuming today's birth rate, would require 60m immigrants. Managing an ageing society requires a package of later retirement, rising productivity and limited immigration. Large-scale immigration of unskilled workers does allow native workers to bypass the dirtiest and least rewarding jobs but it also increases inequality, does little for per capita growth, and skews benefits in the host population to employers and the better-off.
http://www.guardian.co.uk/comment/story/0,...1154693,00.html