Health Equity in a Globalizing Era: Past Challenges, Future ProspectsWhy do some countries and populations suffer from poverty and ill health, whilst others are more prosperous and healthy? What are the inherently global (trans border) issues that affect inequities in disease burden and health opportunities for individuals and nations? Traditionally, the focus of global health has been 'international health': the concern for high burdens of disease in generally low income countries. To answer these questions however,