Certainly, when Obama talks, others listen. And this is definitely true when he talks about $14 billion. Obama pledged to invest more than this amount in Africa while speaking at a meeting of African leaders recently. His remarks came during the US-Africa Business Forum. Speakers and attendees included former president Bill Clinton, Wal-Mart president and chief executive Doug McMillon, MasterCard president and chief executive Ajay Banga and World Bank President Jim Yong Kim.