Monopsony, Job Tasks and Labour Market Concentration
从工作任务角度研究劳动力市场集中度，发现基于任务的集中度低于传统行业或职业指标，且集中度高的市场中失业工人后续就业结果更差，表明企业存在由技能需求集中驱动的市场势力。
Abstract This paper extends the monopsony literature by taking a task-based approach and estimating the causal effect of concentration on labour market outcomes. Using detailed employer–employee data from Norway, we find that our job task-based measure shows lower degrees of concentration than conventional industry- and occupation-based measures. Exploiting mass lay-offs as exogenous shocks to local labour demand, we show that workers who experience mass separations in more concentrated markets have substantially worse subsequent labour market outcomes than workers in less concentrated markets. Our results point to the existence of employer market power that is driven by the concentration of skill demand across firms.