What is the link between psychology, advertising and propaganda?

What is the link between psychology, advertising and propaganda?

Watch the documentary The Century of the Self and summaries the main points and
answer the question ” What is the link between psychology, advertising and
propaganda?”. provide at least two direct quotes at least two of the film.
The Century of the Self – Part 1: “Happiness Machines”

The Century of the Self – Part 2: “The Engineering of Consent”

The Century of the Self – Part 3: “There is a Policeman Inside All Our Heads; He Must Be
Destroyed.” https://www.youtube.com/watch?
v=ub2LB2MaGoM&ab_channel=JustAdamCurtis