THE DYNAMICS OF DUAL JOB HOLDING AND JOB MOBILITY

This article concerns dual job holding and its link to job mobility. W e present evidence from U.S. data on patterns of dual job holding, hou rs changes, and job mobility. We find that workers move into and out o f second jobs frequently, that these movements are associated with lar ge changes in work hours, and that hours constraints may prompt worker s to take second jobs. Second, we review theories of dual job holding and present a stochastic dynamic model of dual job holding and job mob ility in which decisions to take second jobs and/or change main jobs a re made simultaneously.