It matters whether the margin is higher than other investment opportunities of similar scale and risk profile.
Already, the answer is very often no. In Austin, the answer will increasingly be no. That means people will not finance new construction, so if demand continues to grow it will outstrip supply and prices will go back up until the margin on new construction exceeds that of alternative investment opportunities of similar scale and risk profile.
And indeed that amount of uncertainty: will I be allowed to build eventually? How long will I have to pay interests on assets before I'm allowed to build? Can I actually build what's specified in code or will discretionary processes arbitrarily change what I'm allowed to do, 18 months into the project?
It demonstrably is not what people understand it to mean to "the cost to build is lower than the price." The cost to build can be well below the sale price and development still be a totally uninvestable activity.
I guess I don’t see where we disagree?
Austin new housing starts (approx per month):
2019: 1416
2020: 1504
2021: 1495
2022: 2083
2023: 1415
2024: 916
2025: 900
2026: 481
The problem here is that the market obviously does not have perfect information, limited mechanisms to coordinate, and significant lead time. It seems pretty much baked in at this point that many of the projects currently underway will complete into a negative market and (assuming Austin remains somewhat desirable) a whole lot of developers will be wiped out. This will stop development until prices rise again, probably back to a level where housing is quite expensive again relative to local wages.
The question is whether the market achieves equilibrium at a point where 1) developers can get financing to build profitably, and 2) units can be sold at a broadly attainable price to the local market.
The answer appears to be no because the cost of inputs is so high. No one here is talking about directly reducing the cost of inputs. They believe that instead developers will just continue to build units that they sell at a loss, or at least investors will continue to invest in construction that returns less than the S&P 500 or 10 Year Treasuries (they won't).