About the Authors

Yuan Fang

Roles Writing – original draft

Affiliation School of Finance and Economics, Qinghai University, Xining City, Qinghai Province, China

Ying Yang

Roles Funding acquisition, Writing – review & editing

737782712@qq.com

Affiliation School of Finance and Economics, Qinghai University, Xining City, Qinghai Province, China

Competing Interests

The authors have declared that no competing interests exist.