> Any kind of price control seems to make economists very upset, rent control being another example.
They're probably upset the same way that climate scientists get upset when people dispute climate change; that is, it's a widely-studied phenomenon by economists of all political persuasions with lots of evidence to back it up.
A price ceiling causes a shortage, like cars lining up at gas stations during the 70s oil crisis or the 10+ years of wait time in Stockholm apartments. A price floor causes a surplus, like unemployed workers at the minimum wage.