Hanoi’s streets (in 2007, above) are now full of motorcycles and scooters, and shop shelves are no longer bare. Photograph by Chau Doan/Getty Images

building”>harvardmagazine – A RECENT Monday morning, during a class on global trade, the professor reviewed the effects of nations’ limits on such commerce: tariffs, quotas, and the “voluntary” restraints exporting countries impose on their shipments to eager customers (lest protected interests in the importing area wilt). His students, arrayed in a teaching amphitheater laid out like the classrooms at Harvard Business School (HBS)—complete with laminated placards bearing each

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