SellTheThings () {
    If [ sells this much in this period of time people or supply is low ]; then 

raise.prices

elif [ the opposite ]; then

lower.prices

else

same.prices

fi
}

A purely mechanical counting/tabulating device could calculate that.

There is zero actual reason for AI.

Even if we assume they want to do discriminatory pricing (they probably do), they can do that without using LLMs. Use facial recognition and other traditional models to predict the person's demographics and maybe even identify them. If you know who they are, do a lookup for all products they've expressed interest in elsewhere (this can be done with either something like a graph DB or via embeddings). Raise the price if they seem likely to purchase it based on the previous criteria. Never lower the price.

That's a complicated process, but none of that needs an LLM, and they'd be doing a lot of this already if they're going full big brother price discrimination.