What is called « urban sprawl » agrees with the growth of a suburb which, instead of pushing in front of itself the discontinuity separating the urban and rural areas, crosses through that qualitative discontinuity. The process finds expression by the implantation, into rural positions, of forms previously conceived in order to convert urban positional values. In the outskirts of Québec City, where it is used to go faster for more than the last 20 years, the sprawl is concerned with an internal dynamics of mimesis which has led the local councils, staying in rural positions, to appropriate the prototype of the urban modernity such as it was implemented by the town of Sainte-Foy since the sixties. By producing urban look like forms on rural positions, the recent "urban sprawl" represents, more precisely, an endeavour oriented towards erasing the political intrinsic character of the discontinuity separating geographical positions. This "manoeuvre" entails economical bull operations in the rural area and, by the way, gets the society as a whole into debt. Nowadays, such a consequence means that it is not possible to confine the political order into the matter of the economical necessity.