The fence sitters on the marketplace might ask both A and B of their experiences and opinions. They will then calibrate that against A and B marketing. Maybe one or two customers might be random, but if it repeats over a longer time, things get quite obvious to everyone in the scene...

https://slatestarcodex.com/2014/07/30/meditations-on-moloch/

It's a very thorough discussion of the topic. A rather long read, but absolutely worth it.

Here's what I think a half-overhaul towards pull-based economy would look like. At a minimum, no advertising in push form whatsoever. That means no ads on the web, no ads in newspapers (on-line or print), TV, no product placement, no leaflets, no billboards. No ads of any kind where you'd encounter them by accident. Product discovery would be focused on company sites, on-line catalogs, mail-order catalogs, on-line product/service search engines, trade shows, and other outlets which were labeled up-front as product discovery. The goal here is that an ordinary person should have full control over whether and when they get exposed to advertising, and secondarily, to make it customer-driven. Make it easy for the person with needs to find solutions to these needs, evaluate different options based on trustworthy information[0], and pick one that works best for them.

That's more-less the idea I have on this topic. It's incomplete, probably a bit incoherent, and definitely not optimal for hundreds of reasons. I expect it to be torn apart, and I'll be thankful for criticism - I can't develop it further without feedback :).

As for how to make any of this happen for yourself, today? I'd start with the obvious - aggressive ad-blocking, avoiding exposing yourself to anything that smells of content marketing, getting rid of your TV service (the hardware itself can still work well for playing games on a console). Never doing product discovery on an e-commerce site. Asking trustworthy friends for recommendations of products and services, and giving recommendations if asked, qualifying your level of certainty and disclosing any conflict of interest. Being proactive about searching for things you need on-line. Perhaps subscribing to an industry magazine, but bearing in mind that it's - to quote Paul Graham, "a bunch of ads, glued together by just enough articles to make it look like a magazine"[1], and otherwise not trusting it further than you can throw it. Inflicting social pressure on people who decide to monetize their friends and family, if you know any (MLMs, influencers). Also, learning to respect your money and not spend it on an impulse - to counter the long-term influence of advertising. Make each purchase a conscious one.

That's more-less what I do. I barely see any overt ads on-line these days. Can't avoid covert ads, can't avoid meatspace ads either, but I can make damn sure that if I feel sudden desire for a particular product or product category, I'll pause and spend some time researching it independently before making a decision. The goal here isn't to stop buying things, but to maximize the utility and happiness you buy per dollar spent.

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[0] - Efficient market requires minimizing information asymmetry. To the extent advertising is spreading disinformation, it's making the market less efficient.

[1] - http://www.paulgraham.com/submarine.html