In 2012, 40 of the world's largest economic entities were public corporations, but it's a number that is down 20% since 2000. This special report explores why and how the distribution of corporate clout is shifting rapidly, with new players and models emerging. It's not enough though to have clout: companies need to start taking responsibility for a greater role in society, commensurate with their influence and impact, according to CEOs of leading global firms.