Page last updated at 10:32 GMT, Wednesday, 10 February 2010

Robin Hood tax on banks 'would raise billions'

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Charities, unions and celebrities are calling for a Robin Hood tax on banks that could raise up to £250 billion a year to fight poverty and climate change.

They say it's a chance to repair the damage to the world caused by the economic crisis.

Richard Westcott explains how it would work.

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