France has witnessed a significant rise in the recourse to sub-contracting over the last twenty years. However the latter is not to be seen as a response to the supposedly growing instability of the economic environment. It is primarily a further stage in the effective subordination of labour to capital. The replacement of direct labour by a commercial relation is used in order to bypass the framework of social legislation which labour had established through its struggles. Contrary to the formal fragmentation of collective labour, capital has maintained its unity and its control of the process of production. Capital thus becomes even more hierarchical, by way of its wilful invocation of an alleged “market constraint”, the aim of which is to engineer a new disciplining of the labour force.