Document is current

Article History

Received: 20 August 2020

Accepted: 27 January 2021

First Online: 18 February 2021

Declarations

:

: This study involves the macro data of human economy and society. All the data are from the official statistical yearbook. The data collection process is in line with the ethical and moral standards. The research method of this study is spatial econometric method, and there is no need for ethical approval and animal experiment content. The author guarantees that the process, content and conclusion of this study do not violate the theory and moral principles.

: Not applicable.

: The authors declare that they have no competing interests.