Source: U.S. Bureau of Labor Statistics
Data measure usual hourly earnings of wage and salary workers. Wage and salary workers are workers who receive wages, salaries, commissions, tips, payment in kind, or piece rates. The group includes employees in both the private and public sectors but, for the purposes of the earnings series, it excludes all self-employed persons, both those with incorporated businesses and those with unincorporated businesses. For more information see https://www.bls.gov/cps/earnings.htm
The series comes from the 'Current Population Survey (Household Survey)'
The source code is: LEU0204844900
U.S. Bureau of Labor Statistics, Employed: Paid below prevailing federal minimum wage: Private wage and salary workers: Retail trade industries: 16 years and over [LEU0204844900A], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/LEU0204844900A, August 19, 2019.