Beside the point that advertising tries to make the "aggregate" biased, we can leave that behind and simply ask you: when in the history of humankind has the "impartial market" in fact, even been impartial? You argue hypotheticals that have never existed.
What will you say next, the hand of God controls the market? (I jest, I really would like to know when, in all of human history, this impartial or free market has ever existed)