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In the 1990s, Paul Romer revolutionized economics. In the aughts, he became rich as a software entrepreneur. Now he’s trying to help the poorest countries grow rich—by convincing them to establish foreign-run “charter cities” within their borders. Romer’s idea is unconventional, even neo-colonial—the best analogy is Britain’s historic lease of Hong Kong. And against all odds, he just might make it happen.

Halfway through the 12th century, and a long time before economists began pondering how to turn poor places into rich ones, the Germanic prince Henry the Lion set out to create a merchant’s mecca on the lawless Baltic coast. It was an ambitious project, a bit like trying to build a new Chicago in modern Congo or Iraq. Northern Germany was plagued by what today’s development gurus might delicately call a “bad-governance equilibrium,” its townships frequently sacked by Slavic marauders such as the formidable pirate Niclot the Obotrite. But Henry was not a mouse.