People seem to think I'm arguing for "free markets" because I'm arguing against rent controls. I'm not. In fact, quite the opposite. I'm just recognizing that people respond to incentives, and we need the incentives to be aimed at
lowering housing costs and not just "protecting" incumbents.
The problem of unaffordable housing is solved by creating and incentivizing an artificial oversupply of housing.
There are many ways to do this. Vienna, for example, did this with public housing. Econ nerds will argue for a land value tax. Houston, Texas, does it in the worst way possible... by creating an unsustainable sprawling mess that will collapse in exactly the way that Strong Towns predicts.
>how can "free market" supply increases lower housing costs?
Ultimately, if we eliminate the political/regulatory constraints for the sake of argument, the cost of housing is just the marginal cost of building the next unit of housing. There isn't any way around that, so if you want to live in Manhattan, say where high rises exists, the marginal cost of housing will be more expensive than, say, a tiny house in woods somewhere.
If that marginal cost of housing becomes unaffordable, even for the government, then we have a real economic problem that needs to be solved apart from housing. We are dealing with that in California, as simply the cost to actually build something is has become so inflated, that it is unaffordable for the city to even build public housing.
How we can get people to create an oversupply of housing in a private market, we could do in various ways. Property taxes is the easiest: land value taxes, or say, high property taxes with a large discount for each resident that lives in the taxable area. Ultimately, in this view, housing should be a cost... not an investment. Because under the rubric I put forward, there is no reason housing should appreciate in price in real terms far beyond the marginal cost of the housing itself.
While there are ways to do this practically, the problem is that they tend to be politically unpopular for the reasons I listed earlier... people don't actually like change, or density, and will often vote against it whenever they can. Dealing with this is a political problem... one that requires having difficult conversations with both capitalists and socialists about what we actually want, and whether we want affordable housing, or whether we want a "kind of place" to live in, because we usually can't do both in the most desirable areas to live.
It's a tough problem, and it's one I've thought deeply about for decades as I've unfortunately grown up in, and live in since, high-demand areas with increasingly unattainable housing situations, and I've heard all the argument, and think most people are not typically concerned about creating sustainable solution over quick-fixes.