The two economists Keith Bailey and James Spletzer develop a “New Measure of Multiple Jobholding in the U.S. Economy”. They find that 7.8 percent of persons in the U.S. are multiple jobholders:
https://www.iza.org/publications/dp/13693/a-new-measure-of-multiple-jobholding-in-the-us-economy?
The “Digital Finance Package” of the European Commission:
https://ec.europa.eu/commission/presscorner/detail/en/IP_20_1684?
Employment and real output growth projections of the Bureau of Labor Statistics for the period 2019 to 2029:
https://www.bls.gov/opub/mlr/2020/article/projections-overview-and-highlights-2019-29.htm
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