The liberal economist Philippe Legrain has been asking 'why are so many people are against the free movement of labour'. He's just published a new book arguing the case for open borders, in which he assembles strong evidence that immigration brings benefits to everyone. He says that immigration controls really just boil down to fear of change or to racism. The Guardian have just published a think piece of his on immigration to Britain entitled Don't believe this claptrap. Migrants are no threat to us.