David Y. Yang.Niles Singer/Harvard Staff Photographer Nation & World When global trade is about more than money Economist’s new tool looks at how China is more effective than U.S. in exerting political power through import, export controls Christy DeSmith Harvard Staff Writer August 27, 2025 6 min read International trade can yield far more than imports and exports. According to David Y. Yang, Yvonne P. L. Lui Professor of Economics, trade can be used to wield political power. Yang watched ...