The authors thank Liran Einav, Masakazu Ishihara, Ganesh Iyer, Ginger Jin, Tesary Lin, Stephan Seiler, Greg Taylor, Hans-Joachim Voth, and Zemin Zhong for helpful comments. The authors are grateful to editor Puneet Manchanda, the anonymous associate editor, and two reviewers for constructive feedback. The authors thank Lee Hao Rong Javier for excellent research assistance. Any remaining errors are the authors’.