Because our power can only be used if we are willing to become even more involved with others all around the world in an increasingly inter-dependent world.

CNN: Bill Clinton Speaks To A Meeting Of Newspaper Editors

Sir Martin argued that in a globally inter-dependent world, where some companies operate in hundreds of countries, firms interested in building long-term brands would not "do things that will upset consumers".

BBC: WPP Martin Sorrell says tax 'a question of judgement'