Notes: Part time is defined as usually working less than 35 hours per week on the primary job. Part-time for noneconomic reasons category includes workers who say they work part time to take care of child care problems or for other family and personal reasons. The symbols *, **, and *** indicate that the wage penalty is significantly different from zero at the 0.10 level, 0.05 level, and 0.01 level, respectively, using heteroskedasticity-robust standard errors. Standard errors are available upon request from the authors. The noneconomic reasons include all those the BLS categorizes as "noneconomic" reasons: for working part time include “child care problems,” “other family/personal obligations,” “health/medical limitations,” “school/training,” “retired/Social Security limit on earnings,” “full-time workweek is less than 35 hours,” and “other for non-economic reasons.”  The sample of 1,756,419 observations is hourly and nonhourly wage earners, ages 16 and older, in the 2003–2018 EPI extracts of the CPS-ORG. Observations with allocated hourly wages or weekly earnings are excluded. Demographic controls include race, gender, and education dummies, and a quintic polynomial in age. Industry and occupation controls are dummies for Census recodes of major industry and occupation categories. Dependent variable is log hourly wages.