Eligibility for GAVI funds is restricted to countries whose per capita gross national income (GNI) was below US$1,000 in 2003. Reaching the Poor with Health, Nutrition, and Population Services: What Works, What Doesn't, and Why, World Bank, Washington, D.C., 2005. While this is encouraging and can contribute to reducing gaps across countries, it does not guarantee—except in the case of massive campaigns reaching a significantly large share of the population—that inequality within given countries will be reduced and that the most disadvantaged groups will be reached.