On Dec. 10, Argentina’s President Mauricio Macri entered the Casa Rosada with a mandate to revive a sputtering economy and take the country in a new direction. The agenda is long, including revitalizing the export sector, controlling inflation, and bringing in foreign direct investment. After 12 years of left-leaning rule by first Néstor and then Cristina Fernández de Kirchner, Macri seeks to move South America’s second-largest economy from an inward-looking, clientelistic state to an open, internationalist one. This long-overdue shift could open a new flood of trade and foreign direct investment — but it could also set the stage for a larger shift…