Governments around the world lose hundreds of billions of dollars every year in unpaid tax, money that is often desperately needed for essential public services and ensuring economic growth.
But what can we do about the fact that not everyone is paying their fair share?
A few months ago in the midst of the global economic meltdown, world leaders decided to crackdown on tax havens, countries whose lax financial regulations make tax evasion possible.
Has anything changed? Hamish Macdonald has been in search of the world's missing millions.
Part two: Ivory Coast
Once regarded as a driving force in West Africa, the Ivory Coast is in dire straits today.
Its economy was left in tatters by an armed uprising in 2002 that split the country in half and led to prolonged instability, unemployment and violence.
After long delays, the country is now heading towards elections scheduled for the end of the year.
In the meantime, many Ivorians, particularly in the country's largest city Abidjan, remain frustrated by the continuing paralysis.
This episode of People & Power can be seen from August 26, 2009 at the following times GMT: Wednesday: 0600, 1230; Thursday: 0130, 1930; Friday: 1630; Saturday: 0330, 2030; Sunday: 0030, 0530; Monday: 0830.
Source: Al Jazeera