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Globalisation is a trend based on movement - of money goods, ideas and people - across continents and national borders. In a world of glaring inequality it has stirred a powerful backlash manifested in the rise of nationalism and identity politics. This clash of human impulses is fertile territory for the Pakistani novelist Mohsin Hamid. In his novels he has explored cultural, economic and religious tensions between east and west - rich and poor. His latest book focuses on migration; why does it frighten so many of us?