Trade unions in Europe face a range of cross-cutting challenges. This includes the near-universal contraction in union membership; the related decline of traditionally highly unionised blue-collar industries; and the rise of automation, microprocessing, and digitalisation, which can make it cheaper for employers to invest in machines than to pay humans to work. The breakdown of the standard contract of employment and increasing rates of precarious work have further transformed the world of work. Taken together, this makes any collectivist vision of society, and the notion of solidarity upon...