I'll be honest I am approaching this from a DEX point of view, so what you say I'm sure is true for traditional markets and on that I will hold my hand up and say I'm wrong.
But on a Dex, using an automated market maker, I can buy an asset without requiring a seller on the other side of the trade.
The algorithm will adjust the price based on the liquidity of the pairs in the pool
More buy pressure price goes up, more sell pressure price goes down.
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it's just a misunderstanding of how markets work. there is always 1 seller and 1 buyer, and both parties agree on a transaction price. in theory, both parties are happy with the price and the transaction. advanced trading systems don't remove either party, even if they sometimes remove the thinking brain from the transaction.
But on your "more buy pressure... more sell pressure" that's probably at best a misunderstanding of supply and demand, which is classical economics.