Unless they are used as strictly temporary measures, rent-control ordinances (municipal regulations placing limits on rent increases) have several negative effects for renters. One of these is that the controls will bring about a shortage of rental units. This disadvantage for renters occurs over the long run, but the advantage—smaller rent increases—occurs the desire for short-term gain that guides those tenants in the exercise of that power.
What this question is testing
Premises
Two key claims. First: rent control, if not strictly temporary, causes a shortage of rental units in the long run. Second: in municipalities where renters control politics, they always vote for the short-term win — meaning they'll keep rent control going for the immediate benefit, even though it'll cause a shortage later.
Anticipate
Stitch them together. Those municipalities will have rent control on a non-temporary basis (because tenants keep voting for it). That means those municipalities will eventually have a shortage of rental units.
Think of it like eating dessert before dinner every night because it tastes good now. Eventually, you'll be malnourished — that's the long-term cost the short-term thinking ignores.
Goal
An answer that says: in many municipalities, there will be a shortage of rental units, now or eventually.
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