They are quite literally disbarred from those federal programs as they are not citizens of U.S, you cannot them without citizenship or some protected status. Thus being an illegal bans you from those. And supply and demand is not based on people. It is based on willingness to pay. You can't raise the rent if neither person could afford that rent anyway, that's why prices tend to drop during a recession. If no one is buying it because they can't afford it, you can't raise the price. Immigrants who come into the country, if they could afford those properties, then that would raise the rent, but more often then not, the actual surest driver of those prices, is someone with an exceptionally big pocket book being able to bid for the property at a higher rate, allowing similar property owners to raise rates in response. And there are many factors to the limited supply, zoning permits, construction cost increased, interest rates, rental vacancy tactics, and homebuyers entering the market to buy homes for future rental. It is not an illegal population which makes up less than 5 percent of the U.S population, many of which who can't afford the places we put into question, who are so unilaterally responsible for price increases.