Every article on "Where do stock prices come from?" seems to just talk at a high level about supply and demand.
But where does the price come from at a nitty-gritty level? Is it an average of all existing offers or something?
Do different exchanges and stock-ticker websites have different formula for calculating share price?
If a very low-volume stock is listed at $4, and then I offer to buy a share for $100, does the NYSE suddenly start listing its price at $100?