The advance in technology has been partially a consequence of the increase in radio programming. This accompanies and will continue to accompany the development of pre- programming of radio stations. Following a rationalisation of demand through pre-programming, radio stations need to ensure that they are included in the 'basket" or set of stations pre- selected and pre- programmed by each listener. This phenomenon is becoming more and more important because the number of stations heard is constrained. This article provides previously unavailable information on pre- programming and the number of stations heard in France. Potential demand is defined by stations that are pre- programmed while discriminating from actual demand which is represented by those stations to which the listener actually listens.