Austin’s Surge of New Housing Construction Drove Down Rents

After decades of explosive growth, Austin, Texas, in the 2010s was a victim of its own success. Lured by high-tech jobs and the city’s hip reputation, too many people were competing for too few homes. From 2010 to 2019, rents in Austin increased nearly 93%—more than in any other major American city. And home sale prices increased 82%, more than in any other metro area in Texas.

Its wild how the solution to housing costs is really just:

Build more housing. Keep law and order.

No it doesn’t need to be “affordable”. Yes rent control is a terrible idea.

Just build more housing.

Note: that the US already has plenty of housing and housing costs basically go up in areas of low crime relative to economic opportunity. If you build housing, but allow crime to rise, you have wasted everybody’s time.

New construction has already decelerated in Austin due to falling prices, which compresses already-near-zero margin on real estate development.

So yes, it really is "just build more housing." The problem is: why would you build more housing as prices fall?

I'm confused by this objection, if you draw a stereotypical supply and demand curve, you can see how prices settle to an equilibrium point. Of course reality has more complications, but I think your objection is 95% answered by a supply and demand curve. You keep building houses when it is profitable. You stop when it is not. This naturally keeps everything in balance.
I have struggled to understand why houses don't get built and land sits idle for years. I can only assume that it's significantly more complicated. I'm not trying to excuse the complications. I guess if the house prices are forecast to go up, you build some houses, but not all that you can because the longer you wait, the higher the profit will be on the ones you start later. If house prices are going down, even if it's profitable when you start, you're not likely to build houses because you might be left holding houses that will sell at a lower margin. If there was a tax on unused land, that might skew things towards building more even if prices are declining, but I'm sure there are lots of views on that.

Why would you build on a plot of land when the plot of land itself is already appreciating in value with you doing nothing to it

Building is risky and costly

Having an asset that appreciates on its own regardless of what you do with it is not

Holding costs of land are far from $0 in any major metropolitan area. Sitting on it involves its own form of risk.

Vacant land that's desirable is often held back from development due to zoning or infrastructure issues.

> Vacant land that's desirable is often held back from development due to zoning or infrastructure issues.

Nah, it's mostly speculation. Zoning/infrastructure issues get baked into the price. If you cannot build anything on a plot of land, its price falls.

Only at point of buying. If you buy some land and the mayor suddenly implements rent control then the value goes down.