Yanqing Jiang is Professor of Economics at the School of Economics and Finance, Shanghai International Studies University, China. He received his PhD in economics from the Hanken School of Economics in Finland. His recent research works include over 50 journal articles and 10 research monographs published by well-known academic publishers. Xu Yuan is a graduate student in economics at the School of Economics and Finance, Shanghai International Studies University, China. Her main research field is environmental economics. She has published several academic papers in various journals such as Resources Guide, Resources Economization and Comprehensive Utilization, and Environmental Impact Assessment.