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Multiple job holding as a strategy for skills development

机译：多项工作持有作为技能发展的策略

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This study investigated the training effect of multiple job holding on the activity of main jobs. First, we developed a dual-labor supply model by adding the training effect of working second jobs. The theory showed that workers with unconstrained hours hold second jobs when they develop skills via the experience of second jobs. To verify the hypotheses from the theoretical model, the causal relationship between holding a second job and the wage rate of a main job was estimated using the Keio Household Panel Survey. Difference generalized method of moments was adopted to remove time-invariant individual effects and endogenous bias. Moreover, the estimations showed heterogeneity of main jobs in terms of length of working hours, tasks, and job turnover. Full-time workers engaged in intelligent tasks and those who did not change their jobs secured training effects from second jobs but only when the comparison group was the workers allowed to hold second jobs by their employers. It was presumed that employers paid to restrict employees' activities. On the contrary, part-time workers engaged in physical tasks were exhausted by second jobs, which decreased the wage rate of their main jobs.
机译：本研究调查了多项工作持有对主要工作活动的培训效应。首先，我们通过增加工作第二岗位的培训效果开发了双劳动供应模型。该理论表明，在通过第二份工作的经验开发技能时，有没有约束的工人举行了第二个工作岗位。为了验证理论模型的假设，使用Keio家庭面板调查估计持有第二份工作与主要工作的工资之间的因果关系。采用差异推广矩的瞬间方法来消除时间不变的个体效应和内源性偏差。此外，估计在工作时间，任务和工作营业额的长度方面表现出主要工作的异质性。从事智能任务的全职工人和那些没有改变工作的人从第二个工作中获得培训效果，但只有当比较群体是雇主允许第二份工作的工作人员时。据推测，雇主支付旨在限制员工的活动。相反，从事物理任务的兼职工作人员被第二份工作耗尽，这减少了其主要工作的工资率。

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