Sweden has rent controls, which has caused long queues to apartments (we're talking wait times of 20 years) as well as a significant grey/black market in second

Sweden has rent controls, which has caused long queues to apartments (we're talking wait times of 20 years) as well as a significant grey/black market in second, third and even fourth hand contracts, because the regulated first contract is so valuable that people keep them and rent them onwards. It has also created situations where e.g. trade unions and other organisations (who own rental apartments) arrange nicely-located apartments to friendly politicians (and their relatives) ahead of the queue at very advantageous rents.