The “demographic dividend,” a concept that marries population dynamics and development economics, is on the rise in policy circles – Rajiv Shah, Melinda Gates, and African government ministers have all discussed it recently in high-level forums. Most notably for demographers, World Bank Chief Economist Justin Yifu Lin wrote a blog post that focuses on the demographic dividend’s potential to give developing countries a powerful economic boost through declining dependency ratios and a proportionately large working-age population.