An additional job need not represent an additional employed person. This distinction is central to interpreting the two employment measures in the U.S. monthly labor report. A business reports positions on its payroll; a household reports the employment status of its members. Their changes can differ even when respondents describe their circumstances accurately.
The Bureau of Labor Statistics comparison of the surveys identifies the relevant boundaries. The establishment survey counts nonfarm payroll jobs and counts a person separately at each covered employer. The household survey counts employed people once and includes categories, such as unincorporated self-employment, outside the payroll measure. It covers the civilian noninstitutional population aged 16 and older. These distinctions make a direct subtraction of the published totals difficult to interpret.
A second job changes one count
Consider a hypothetical group of 100 employed people. Each holds one covered payroll job, and ten also hold a second covered job. The group supplies 110 payroll jobs but contains 100 employed people. If five other members take second jobs, the payroll count rises to 115 while the person count remains 100. Payroll growth is approximately 4.55 percent; growth in employed people is zero.
Neither calculation identifies whether total hours increased by the same proportion. A second job could add ten hours a week, replace overtime at the first employer, or substitute for hours that the first employer reduced. The job count records an employment relationship, not a fixed package of working time.
Now suppose three of the original single-job employees leave payroll employment and start unincorporated businesses, remaining employed throughout. The covered payroll count falls from 115 to 112; the number of employed people stays at 100. The movement concerns employment composition. It does not establish a corresponding fall in the number of people working.
These examples contain no survey error, population adjustment or economic contraction. They are accounting illustrations, not estimates of the contribution of multiple jobholding or self-employment to any reported U.S. divergence.