La relation entre la télévision et son public : qui influence qui ?

Who influences whom ? In the media sphere, this question remains crucial to understand everything related to media ( TV, radio, cine ). We will thus examine this topic in order to determiner who the rulers are in the TV sphere : channels or the audience ? Who determines programs ?
In a first part, we will scan the programming logics through an analysis of US TV and then in a second part we will illustrate this topic with case studies or thrillers
( Columbo ), comedies ( Bewitched ). That will led us to try and answer the question : who influences whom ?