Funding for this research was provided by:
National Science Foundation of China (71873119)
Ministry of Education of China (19JHQ060)
CTF Young Scholar Fund
Zhejiang University-IFPRI Center for International Development Studies (126000-541902)
Received: 13 May 2020
Accepted: 30 June 2020
First Online: 8 July 2020
Compliance with ethical standards
: The authors declared that they have no conflict of interest.
Free to read: This content has been made available to all.