Todorov's Theory of Equilibrium

Tzvetan Todorov came up with the theory of equilibrium as a simplified version of the narrative theory, by using 'equilibrium' (meaning: a state of rest or balance due to the equal action of opposing forces) and 'disequilibrium'. He split the narrative up into 5 simple stages:

1. A state of equilibrium - where everything is as it should be and there is an equal balance of power.
2. Disequilibrium - a disruption of this order by an event
3. A recognition that disorder has occurred
4. An attempt to repair the damage cause by the disruption
5. A return of equilibrium or a new equilibrium

These stages are seen as a circular structure, as eventually the day-to-day life from the beginning is restored. The narrative is usually based around the attempt to restore the equilibrium.

Most films follow this structure however in trailers the last stage is usually missed out in order to create a sense of mystery and suspense.