Earlier quoted context omitted.
this sounds alright in textbooks, but in reality housebuilders realise they make more money when house prices rise as they build..
Who generally makes more money overall - luxury brand with a small market or run of the mill brand with a massive market?
It is much easier to focus resources ($$ and labor) on building 1 luxury building with 20% margin than building 10 buildings with 2% margin (and much higher risk that a single misstep results in a loss).
In theory, this reduces pressure on the mass market properties, because it reduces the number of high-income people in the marketplace.