I always found it odd that rent control always seems to be an all-or-nothing policy: either things are tamped down on, or it's a laissez faire system.
Does any locality have a "hybrid" approached. Something like:
* buildings 0-5 years old, allow up to 3x inflation rent increases
* buildings 5-10 years old, allow up to 2x inflation
* 10+ years old, allow only at inflation
This would (in theory?) encourage the construction of new rental units by allowing investors to recoup their costs sooner and counter the risk of any unforeseen expenses. But as the buildings get older, and costs (theoretically) become more predictable, stabilize prices for renters.