There are few mechanisms through which rent control can hurt.
Rent control discourages building more units. The more you can make from rental, the more companies will invest in new construction projects.
Rent control can decrease efficiency of living situations. You can imagine an old woman living alone in a 3 bedroom unit with rent control because it would be more expensive for her to move to a smaller unit. Or someone who gets a new job far from their current rent-controlled apartment but won't move out because the rent is so much cheaper.
Rent control discourages building more units. The more you can make from rental, the more companies will invest in new construction projects.
Rent control can decrease efficiency of living situations. You can imagine an old woman living alone in a 3 bedroom unit with rent control because it would be more expensive for her to move to a smaller unit. Or someone who gets a new job far from their current rent-controlled apartment but won't move out because the rent is so much cheaper.