What is 'rich'?

How much money makes you rich? BBC reporters in Mumbai, New York and Mexico City investigate.

Plus, should businesses play a role in sharing out wealth more fairly?

Lesley Curwen discusses this with Rachel Rhodes, chief financial officer of London Mining Company which employs 1,300 people at iron ore mines in Sierra Leone; Robert H Frank, economics professor at Cornell University; and Business Daily's Kenyan commentator Wycliffe Muga.