Triangle of dependency

The triangle of dependency suggests that institution, text and audience all interlinked and influence each other in a certain way.

So: The audience influence the text as it is written for them and so it includes what they want to consume and the text influences the audience as it attracts certain viewers.

The institution influences the audience as if things change in a society they need to change to adapt to these.

Finally the institution changes there text to keep up and cater for audience wants and needs.

It is important to meet the audience's expectations when making a film/trailer, as they are the reason people make films, in order to entertain them and make them want to watch the film. People do not make films for themselves they make them for an audience who will enjoy them and will go and watch them.