How do you quantify "incentive"? Is a landlord really looking at 5% lower property value and deciding it's not worth investing? Is this even true in aggregate?

It is a major paradigm in economics that if you change this by X% it will change something else by Y% and to estimate that ratio. It may be that people don’t really think that way: economic growth seems to be continuous and exponential in character whereas economic dislocations are discontinuous in character.

I think of how I was absolutely shocked when a Big Mac meal was $10 during the pandemic (I think it cost about $2.50 the first time I bought it) and didn’t think I was going to buy 4% less of it but rather I skipped the fries.

Well, there's 2 ways to become a landlord: to buy a house or to build a house. I was focused only on the second way.

The cost of the wood and the labor needed to build the house is unaffected by the rent control, so if cost remains the same, but the reward (or "revenue") from building the house decrease from $100K to $95K, then fewer houses will get built.

Yes. Since the source paper was written, St. Paul has realized that this is the case and rolled back rent control on new construction to hopefully solve the problem. (https://minnesotareformer.com/2025/05/08/st-paul-walks-back-...)