There are many reasons for this, including the complexity of education investments, weak global governance, and – of course – money. The three largest global health-financing institutions (the Global Fund to Fight AIDS, Tuberculosis, and Malaria, the GAVI Alliance, and UNITAID) will have spent more than $55 billion by 2015, with roughly $7 billion coming from innovative financing mechanisms such as vaccine bonds, the airline levy, and debt swaps.