Also called “average earnings per worker”, average earnings is the result of total pre-tax industry earnings divided by same-year industry employment. Earnings are defined as labor-related personal income—that is, income from work. Income from stock dividends or interest, rents, Social Security and other non-work sources are not included.
Average earnings is the sum of wages and salaries, and supplements. For further explanation, see this article.
Sources:
US: BLS’s QCEW dataset (wages & salaries), BEA (supplements).