Advertising is the world's oldest technology. 30,000 years of development. Super powerful. What would it look like if literally everybody bought the latest scam?

Advertising is not a technology and there is no evidence that advertising occured 30,000 years ago. That time period predates capitalism, products and competition among manufacturers, and written language.
- Given how wide a range your response are in the post, what you call "advertising" is better described as "communication". No?
- Advertising is a method of persuasion.
  It's as old as civilization.
  We advertise for various reasons, selling products is just one of them.
  And yes, over time, we have developed new advertising techniques.
  A body of techniques is what's referred to as a "technology".
  
  Advertising is a communication technique to bring attention to something.
  You are mostly talking about commercial advertising, which is still not technology.
  Where did you find that definition of technology?
  
  What are you even on about? Persuasion is not advertising. And in the absence of a material culture for advertising, there is literally no basis for the 30,000 year claim. This is pure nonsense and the worst kind of bullshit.
  
  Technology can therefore be defined both as an ensemble of deliberately created processes and objects that together accomplish some function as well as the associated knowledge and skills used in the conception, design, implementation, and operation of such technological artifacts.
  O. L. de Weck, Technology Roadmapping and Development, https://doi.org/10.1007/978-3-030-88346-1_1
  
  By your logic, a political or religious speech would be advertising.

I don't understand what you're asking.
- Given this technology of persuasion (advertising). A technology that is insanely powerful (so powerful that convincing literally everybody of literally anything is a power that is comfortably within our grasp). What would it look like if everybody was persuaded to believe some total bullshit?
  I mean what would it look like, to us, if we found ourselves in the midst of such a predicament?
  
  We're living in an age of demagoguery, I don't know why you wouldn't use that metaphor instead of the relatively harmless advertising, it's much more important and you can look around and see what it's like.

Exactly what mainstream human life is now.
- That would imply that I am wrong about something and so are all my friends.
  My cherished belief, in which I am heavily invested, upon which all of my important ideas are based, is actually total bullshit.
  Given the choice between that hard truth and a tasty lie, I might choose the lie.

There are plenty of scams people buy into daily…using Google, Apple or Android phones, capitalism…