Philanthropy or investment?

What's the best way to spread this wealth? Some - like billionaire philanthropist Bill Gates - believe the best way to help Africa's poorest people is for the super-rich to share their wealth through charitable donations. Dr John Coors - an American millionaire - used to think so too. But now he says investment - rather than sharing riches - is the key to economic development. He's behind a new private equity fund that's supporting businesses in sub-Saharan Africa.