Abstract: The authors map turnover of workers and jobs in Danish manufacturing over the 1980 to 1991 period, using information about all individual manufacturing plants. They examine the relation between worker flows and job flows and the authors study separations from, and hires to, existing jobs (replacement hiring) in detail. Their results reveal large heterogeneity among workers as well as plants, even adjusting for the level of job flows. The cyclical properties of worker reallocation point to worker-flow dynamics being driven by workers quitting in upturns to find better jobs, rather than by plants upgrading the labor force in recessions.