How Are Apartment Prices Determined? They Change Daily, If Not More Often. I Suppose It’s Somewhat Like Stock Prices. But Those Algorithms Or Whatever Have Been Set In Stone For Like 150 Years.

If apartment community XYZ has 5 units left of floor plan A1, and 3 are leased, there are only 2 A1’s left, and the price goes up 20% (for example).
Who determined this beforehand? And if the algorithm/whatever decision making exists for all these apartment communities, how is that not price fixing? There are only 3-4 data companies who handle the entirety of this data from what I can find online.
I’m curious because Realpage has a big lawsuit against them (link here) (another link here). But if there are only 2-3 other companies who handle the same data, it can’t be much different from how these prices are determined.