In this week's Global Prosperity Wonkcast, CGD president Nancy Birdsall explains a proposal for Cash on Delivery Aid, which would pay developing countries for incremental progress toward an agreed goal without specifying how the goal should be achieved. For example, a donor would pay $200 for each additional child who finishes primary school and takes a test. "We have to create a system in which outside resources actually help the developing-country governments find out what works in their particular setting," says Birdsall.

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Will the Gates Foundation's new 10-year, $10 billion commitment to help research, develop, and deliver vaccines for the world's poorest countries have the unintended consequence of crowding out other investments? Ruth Levine, CGD vice president and senior fellow for global health, offers nine ideas for the Foundation to make the most of the generous gift by crowding in other money instead.

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