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Yet even if one agrees that a country has a right to restrict immigration, it does not follow that it ought to do so. Mr Legrain argues that it is not just in the global interest to have free migration, but also in that of recipient countries. A standard “gains from trade” analysis would suggest that this should be true. But if one is to argue for free movement of labour on economic grounds one needs a sense of the likely consequences. Analyses of free migration in the presence of huge real wage differentials suggest that we would end up with vast informal sectors and shanty towns. That is what happens within poor countries. Why should it not happen across the globe? I cannot see how one would persuade a host population that this outcome would be in their interests.

But the same powers will also be handed to the tax authorities, 475 local councils, and a host of other organisations, including the Food Standards Agency, the Department of Health, the Immigration Service, the Gaming Board and the Charity Commission. The initiative, formulated in the wake of the Madrid and London terrorist attacks of 2004 and 2005, was put forward as a vital tool in the fight against terrorism. However, civil liberties campaigners say the new powers amount to a 'free for all' for the State snooping on its citizens.

The new measures were implemented after the Home Secretary signed a 'statutory instrument' on July 26. The process allows the Government to alter laws without a full act of Parliament.

"The online encyclopedia is set to trial two systems aimed at boosting readers' confidence in its accuracy. Over the past few years, a series of measures aimed at reducing the threat of vandalism and boosting public confidence in Wikipedia have been developed. Last month a project designed independently of Wikipedia, called WikiScanner, allowed people to work out what the motivations behind certain entries might be by revealing which people or organisations the contributions were made by . Meanwhile the Wikimedia Foundation, the charity that oversees the online encyclopedia, now says it is poised to trial a host of new trust-based capabilities."