The main starting point of this paper is the idea that trade unions do not only care about real wage level but also about a reference or aspiration wage level. After citing a number of empirical works, the paper argues that the attainment of the reference wage is a priority for the union. This...

Theories of social comparison have a long presence in the social sciences and have provided many useful insights. In economics, the idea of comparison, aspiration or relative income belongs to this theoretical framework. The first systematic usages of this idea can be found in the works of...

The starting point of the paper is that trade unions engage in substitution once certain targets have been met. This implies that a priority-based or hierarchical model might be a better approximation to union behaviour. This model requires a two-part union utility function which changes when a...