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The extent of that divide is startling and remains largely unrecognised, as does the fact that it has increased markedly in recent decades. The period from 1965 to 1990 was particularly acute - in 1960 the average GNP per capita for the richest 20% of the world's population was thirty times that of the poorest 20%. By 1995 this had widened to sixty times.

n the way that Heritage Park is a defence against disorder and crime, with its enlightened schooling rooted in the Christian ethos of love and care and helpfully protected by 33,000 volts, so Baladia represents a more aggressive response of taking the war to the enemy. Create your enemy's town, and train your troops to attack with much greater effect.

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.