Article History
Accepted: 16 October 2021
First Online: 3 November 2021
Change Date: 18 November 2021
Change Type: Update
Change Details: The original version of this article was updated. Starting second paragraph under Proposition 1 and Proposition 2 has been changed to upright position.
Declarations
:
: We do not need ethics approval from the IRB as we use publicly available data sets only, such as (1) the U.S. Census, (2) March Current Population Survey and (3) EU KLEMS data, and thus the research does not involve identifiable private information.
: None of us has significant competing financial, professional,or personal interests that might have influenced the work described in this manuscript.