Comment by 0xBDB

> In NYC I can tell you that the metropolitan area lost about 500,000 people since 2020, added ~20-30k housing units per year in that same time. The vacancy rate somehow dropped dramatically despite this and rents also rose dramatically. I've >yet to see any good explanation for this

Taking these numbers as given, the obvious explanation is latent demand. A lot of people who used to live five to a 900 sqft. New York apartment are now living 2 or 3 to an apartment instead. Probably the rent dipped briefly before soaring, yeah? People took advantage, and when leases are up, many of those people will presumably consolidate back with their families.

Very similar to the concept of "induced demand" (which is also really latent demand) with regards to highways. Build new lanes, people who were unwilling to drive before use the lanes, traffic delays stay the same (but with higher throughput, and therefore still a net positive, even if the money would've been better spent on trains).