Back during the Reagan administration when the left was flogging homelessness as "proof" that Republican policies are inhumane, someone on our side did a study of homelessness rates in major cities, and found that with a single exception the top ten homelessness rates were in cities with some form of rent control, NYC leading among them.
The one exception with Worcester, MA, where the homelessness problem had a different character (though it also involved government intervention in the housing market): homelessness in Worcester was mostly due to families with children being excluded from renting in older housing stock due to the very costly form of lead paint remediation that Massachusetts mandated and landlords being able to find suitable tenants without children to whom renting would not require immediate lead paint remediation.
You might remember Mitch Schneider the homeless advocate from the nineties. He became very popular in the media as a spokesman for all the "millions" of homeless supposedly wandering around American cities. He claimed there was
about two and one half million homeless in the country.
Well, some inquisitive person, whose name I can't recall, did an actual analysis of the number of homeless. The figure he arrived at was one tenth or one fifteenth of what Schneider claimed. Schneider couldn't refute the person's analysis. He, Schneider, eventually (and unfortunately) committed suicide.
But even if you accepted Schneider's numbers, the total number of homeless was about one percent of the population. The hysteria generated by Big Media makes it seem like the homeless number is in the tens of millions when it's only, at most, one percent of the population.