We study how employer concentration affects job design, focusing on schedule flexibility as a non-wage job attribute. Using the full text of 46 million UK job vacancies from 2014–2019, we construct new measures of flexible work arrangements using supervised machine learning and large-language-model—assisted annotations. Adopting an instrumental variable strategy using a Bartik-style prediction of the change in employer concentration based on nationwide hiring trends, we show that higher concentration reduces the value of worker compensation partly through shifts toward “risky” flexibility that exposes workers to earnings volatility.

We assess the impact of nationwide minimum wages on employment throughout the whole wage distribution by exploiting geographical variation in the level of wages. We find a substantial increase in wages at the bottom of the wage distribution, while we detect a small, statistically insignificant negative effect on employment. Combining the estimated change in the wage distribution with a tax and benefit microsimulation model, we show that the minimum wage generates considerable proportional income gains up to the middle of the household income distribution.