The Division of Labor

The division of labor is a central organizing principle of production. Existing theories emphasize a static tradeoff: a finer division of labor within firms raises productivity but also increases coordination costs. 

The paper presented in this Mannheim Applied Seminar shows that the division of labor creates a second tradeoff by shaping how workers accumulate human capital. Dividing tasks more finely strengthens learning-by-doing but reduces opportunities to learn from coworkers. Combining population-wide employer-employee records with workplace surveys, quasi-experimental variation in coworker exposure, and experiments among workers and managers, the authors provide evidence on both tradeoffs. Firms with a finer division of labor have higher productivity and greater coordination demands, while workers learn more by doing but substantially less from coworkers, resulting in lower overall learning and slower wage growth. Quasi-experimental variation in coworker exposure provides direct evidence for the role of coworker learning. Vignette experiments reproduce the productivity, coordination, and learning tradeoffs, while choice experiments show that these dimensions shape workers' workplace choices and managers' organizational choices. Accounting for human capital accumulation fundamentally changes the firm's choice of how to divide labor: the organization of production determines not only current productivity and coordination costs, but also human capital accumulation and future worker productivity.