Skill-replacing process innovation and the labour market: Theory and evidence

I study the differential impacts of product innovation and process innovation on the labour market. Using European data from 2000 to 2018, I find that industries with proportionally more firms reporting product innovation than process innovation also tend to exhibit a lower income share of low-skilled workers. To better understand the mechanism, I develop a dynamic growth model in which firms conduct both types of innovation endogenously. In the model, product innovation introduces new intermediate goods, which tend to require high-skilled workers to implement. Process innovation simplifies existing production technologies and thereby allows firms to replace high-skilled workers with low-skilled ones. I calibrate an extended version of the model to the largest two industries in UK in 2014 and 2018, respectively. I find that product innovation has become less costly but increasingly demanding for skills, and the cost of process innovation has increased on average and become more diverse across firms.