学术报告新

Zi Wang is an Associate Professor (with tenure) in the Department of Accountancy, Economics, and Finance at the School of Business, Hong Kong Baptist University. He holds a Ph.D. in Economics from The Pennsylvania State University. Prior to joining HKBU, he served as an Associate Professor at Shanghai University of Finance and Economics, where he also held the position of Academic Director for the Master of International Business (MIB) program. His primary research interests lie in international trade, with secondary focuses on economic geography, development, and the Chinese economy. His work explores topics such as multinational production, trade wars, and global value chains, and has been published in leading journals including the Journal of International Economics, Journal of Monetary Economics, and The World Economy. Additionally, he has taught courses in international trade, econometrics, and managerial economics at both undergraduate and graduate levels.

We develop a multi-country-multi-sector general equilibrium model with trade, globally mobile entrepreneurs, external economies of scale in production, and public goods to quantify the impacts of trade and industrial policy competitions across major economies. To solve highdimensional Nash policies, we propose a deep learning framework, DL-opt, that integrates automatic implicit differentiation (AID) for gradient descent and best-response dynamics (BRD) for Nash equilibria. Calibrating our model to 7 economies and 44 sectors in 2017, we find that tariff wars disrupt international trade and shrink production scales in sectors with strong scale economies, while industrial policy competitions result in excessive industrial subsidies and reduced public good provision, both causing sizable global welfare losses.