A caliper on the opening between main hours and secondary hours

Hour Caliper records how published surveys and papers measure second jobs, leftover hours, and platform-mediated spells—jaws on the definition, not on a reader’s week.

What this shop reads

Notes review household surveys, tax-file studies, and measurement guidance. They name the instrument and the span it can close. They do not publish testimonials or sequences that purport to change a household’s hours.

Readings on the scale

Second-job span in household surveys
How CPS-style multiple-jobholding questions open a second job, and what they leave outside the jaws.
Katz and Krueger: the arrangement opening
What alternative-arrangement modules measure, and why later official supplements do not always close on the same mark.
Abraham on nonemployee compensation
How tax-based measures of nonemployee pay sit beside household hours, and where the two scales refuse to meet.

Shop rules

No presupposition about the reader’s hours or pay.
Named source or no claim. Contested evidence is marked as contested.
Each note states the span the instrument can close.