I think you have the articles argument twisted.
> If you’re going to argue that supply will only go up if you allow price to rise infinitely, you’re getting it backwards- the increase in supply is supposed to make the price go back down, that’s the whole idea. There is supposed to be a balance that develops that holds the price down to an affordable level.
The article argues that the people who construct apartment buildings operate on incentives. Their incentives are the revenue generated by the apartment over, say, 30 years and the cost of constructing the apartment (in materials, regulations, time, ...).
Decreasing the expected rents and/or increasing cost of construction should result in less new apartments (supply increase is slow or nonresistant).
Conversely, increasing the expected rents and/or decreasing cost of construction should result in more new apartments (supply increases quickly).
The article does not suggest:
>supply will only go up if you allow price to rise infinitely
but instead:
>> The right answer to that shortage would be to increase supply — for instance, by cutting red tape in zoning and construction.