In Oregon, they passed a statewide rent control. They pointed out repeatedly at how rent had gone up 30% over five years. The solution, is that now landlords can only increase rent 7% (plus inflation) per year. This year, its something like 9%. Apparently, someone forgot to figure out what >7% per year for 5 years is..... Its 40%, before the inflation numbers are added in.
I don't quite understand how you're framing this. Oregon figured out a level of increase that would be too disruptive for its appetite, and had the legislature cap the rate to below that level. On average over the past five years, that cap would not have been reached, though it may have been reached in any one of those years. Is this a self own or mistake of some kind? Are you inferring that landlords will now raise…
For example, let's say the free market would raise rents 5% this year, and 8% next year. A cap of 7% means the rent will rise 7% this year, as the landlord won't want to have caps permanently reduce future rents.