Timing matters: worker absenteeism in a weekly backward rotating shift model.

Abstract

We analyze the impact of the positioning of shifts (morning, afternoon, night) on worker absenteeism in a large German automobile plant. Using a completely balanced panel of 153 organizational units over the 2-year-period 2009 to 2010 (i.e. 104 consecutive weeks with 15,912 unit-week-observations) we estimate a series of GLM and Fixed Effects models. Our main finding is that during afternoon shifts absence rates are significantly higher than during either morning or night shifts and that absence rates are particularly high during the afternoon shift immediately following the 3weeks of consecutive night shifts. We attribute our first finding to the "social opportunity costs" of working and the second one to a "tax evasion effect". When designing new shift models, firms should try to anticipate their workers' reaction to avoid unintended incentives.