"There is particular focus on the post-communist world, here meaning those countries that were ruled by communist parties until the revolutions of 1989-91. Given that as influential and powerful an agency as the World Bank has identified the source of corruption has identified corruption as the single greatest source of poverty in today's world. It becomes clear why the topic is important, and why it's relevant to concentrate on the post-communist countries." (Quoted from paper) (The paper is only available through the link)