The combination of the decline in the classic model of work and its extension between two ages, young people, created uncertainty at the borders of the labour markets. We are faced with a rather strong paradox: on the one hand, the employee remains the main focal point and full employment the objective and, on the other hand, we can observe objective and subjective breaks with this model. Against this backdrop of the development of precarious employment, social identities among young people are then built up in the articulation of public policies and the implementation or otherwise of projects linked to pathways in which individuals participate partly in the definition of their social status and the formation of their personal identity. The socialisations that produce these identities take place in areas of mobility and immobility around bundles of routes that unite and unite at the borders of labour markets. There are random cultures that can evolve into legitimate work cultures but also into exclusion cultures.