How about people living in bigger apartment they do not need? Or keeping an apartment, they only use for a few months every year? I lived in Prague when it had

How about people living in bigger apartment they do not need? Or keeping an apartment, they only use for a few months every year? I lived in Prague when it had rent control. This was very common. There are other causes as well. But this is not a race, even if rent control contributes only 10% to the problem, it still contributes to the problem.