I get this concept but I dont think thats how it works. The correlation on the prices of a 1000 sq ft to a 3000 sq ft is not 1: if the first one increases 100%

I get this concept but I dont think thats how it works. The correlation on the prices of a 1000 sq ft to a 3000 sq ft is not 1: if the first one increases 100% the second one might increase 50%. In cities, it is often that bigger appts are cheaper per sq/ft because the market for them is much smaller than 1br/2br.