The Chinese leader who took over a squabbling party following the Tiananmen Square massacre surprised the world by stifling dissent, overseeing a staggering economic awakening—and occasionally breaking into song. We examine the lessons to be drawn from his legacy. After scores of failures, a new Alzheimer’s treatment shows real promise. And our annual ranking of the world’s most expensive cities.Help us make the show better: take our listener survey at http://economist.com/intelligencesurvey. For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/intelligenceoffer Hosted on Acast. See acast.com/privacy for more information.