An estimated $1tn (£600bn) a year is being taken out of poor countries and millions of lives are lost because of corruption, according to campaigners.
A report by the anti-poverty organisation One says much of the progress made over the past two decades in tackling extreme poverty has been put at risk by corruption and crime.
Corrupt activities include the use of phantom firms and money laundering.
The report blames corruption for 3.6 million deaths every year.
If action were taken to end secrecy that allows corruption to thrive – and if the recovered revenues were invested in health – the group calculates that many deaths could be prevented in low-income countries.
One describes its findings as a „trillion dollar scandal”.