It is a system that, although sometimes perfectly legal, has facilitated tax evasion, government corruption and criminal activity.
A system that gives the rich and powerful a level of anonymity not afforded to other people.
The so-called Panama Papers have exposed a shadowy financial system that allows wealthy people to stash their assets abroad.
Now there are calls for greater transparency.
But can the leaks really force a change in how offshore tax havens work?
Presenter: Sami Zeidan
George Turner - Director of Finance Uncovered, an investigative reporting and training project.
Nick Bryer - Head of Inequality for Oxfam Great Britain.
Amanda Pinto QC - Chair of the International Committee of the Bar and specialist in international financial wrongdoing.
Source: Al Jazeera