> So back to that family, the landlord notices the market has moved, and he raises the rent 10%. The landlord gains $400/mo. The tenants gain nothing except the

> So back to that family, the landlord notices the market has moved, and he raises the rent 10%. The landlord gains $400/mo. The tenants gain nothing except the “privelege” of non-eviction. It seems like that "privilege" is worth to the tenant than the money, even after the increase. Otherwise they would have moved. Therefore, it is not a zero sum game.