- available
- at a price that the producer makes a profit
- at a price that the buyer can afford
- and does the job
Many such products may exist in a market, some "better" than others but that would be a subjective opinion. The problem with a non-free market e.g. one with monopolies or interference from governments in the form of subsidies, is that it interferes with the above list and you end up with inferior products (in terms of the above list) to those you would've had in a free market. Even the "producer makes a profit" part would be worse because there are less producers making profits, and thus fewer products, higher prices for those products remaining et cetera.
Advertising is not a bad thing in a free market. Fake reviews and the rest are, but they lead to less trust, as we see occur with Amazon, and you would go to a more trusted competitor but Amazon is a monopoly so…
But then I'll day: maybe these guidelines are outdated, 250 years later. For example, does the best product win? Not if the product is complex enough and people cannot quickly measure its quality. There's 10$ crap and 100$ crap, and fake reviews, and paid reviews, and swapped products, and misleading marketing.