Mark 03
CPS multiple jobholding: decompression stops between first and second jobs
The Current Population Survey (CPS) asks employed respondents whether they held more than one job during the reference week. Depth Slate treats the path from primary job to additional job as a set of decompression stops: survey stages that change what can be said about secondary earnings.
What multiple jobholding measures
BLS publishes multiple-jobholding rates from the CPS. The concept is employment-based: whether a person worked at more than one job in the reference week, not a full inventory of all income sources over a year. Self-employment can appear as a second job under CPS rules, but unpaid family work and certain irregular spells may be classified differently.
Research using CPS microdata—including work by labor economists who study moonlighting and hours—often notes that the second job’s hours and wages are thinner than the primary job’s fields. That asymmetry is a property of the instrument, not a judgment about any reader.
Stops between labels and earnings
Stop one: employment status and class of worker for the main job. Stop two: presence of another job in the same week. Stop three: limited characteristics of that additional job. Secondary earnings that arrive as irregular payments outside the reference week can miss the multiple-jobholding flag even when they matter in annual income surveys such as the CPS Annual Social and Economic Supplement (ASEC).
Comparing weekly multiple-jobholding rates with annual secondary-income shares therefore requires care. Analysts who merge CPS employment concepts with tax or bank data frequently report mismatches; Depth Slate records those mismatches as contested or contingent rather than resolving them into a single preferred number.
Method limits
- Reference-week design undercounts jobs that rotate outside the survey week.
- Proxy respondents can misreport second jobs held by other household members.
- Industry and occupation detail for second jobs is often coarser than for main jobs.
- Published rates describe the CPS sample under BLS definitions; they are not personalized earnings guidance.
What this mark does not claim
This note does not advise taking or leaving a second job, does not forecast income and does not present multiple jobholding as a protocol. It logs how the CPS marks the distance between a first job and an additional job so measurement debates stay attached to the instrument.