When many aid workers hear about a problem, they get to work. But Ernesto Sirolli says that's naive and counterproductive. He argues that the first step is to listen to the people you're trying to help and tap into their entrepreneurial spirit.
Author and politician Chrystia Freeland says economic inequality is growing by leaps and bounds. She charts the rise of today's billionaire plutocrats and wonders what the concentration of wealth means for the rest of us.
Historian Niall Ferguson explains why, when it comes to amassing wealth, it's been the West versus the rest for the past 500 years. He suggests six killer apps that promote wealth, stability and innovation — and are now shareable.