Well the movie was about understanding the true meaning of advertisment. Advertisment targets people who will buy there product so they dont run out of buiness. They tell lies and make the product outstanding so the buyer will consdier buying the product that is being advertisted.Thats why adverrtisting is negative to ourcitzens this day.
The quote means that properganda is togegther with demcoracy there as one. You cant do one without the other.