Corruption deprives developing nations of at least $1 trillion (£600bn) every year, according to a report from anti-poverty charity One.
One also claimed as many as 3.6 million deaths could be stopped each year if action was taken to prevent cash from activities such as oil, gas and mining being illegally siphoned off.
The charity's latest report estimates that cracking down on "shady" practices could save countries enough money to provide:
- education for 10 million children
- pay for 500,000 primary school teachers
- provide anti-retroviral drugs for over 11 million HIV/AIDS patients
- 165 million vaccines