If you're interested in knowing what's happening with regard to affordable rental housing for low-income persons, the National Low Income Housing Coalition has been publishing findings since 1974. Founded by Cushing Dolbere (a housing policy expert who passed away 13 years ago) she created a mathematical set of measurements for determining the effect earnings have on home affordability.
Located in Washington DC, they are an advocacy group (political lobby if you prefer that term) that uses data to paint the ever-changing picture of how well we, as a nation, are doing with regard to help prevent shortages of homes for sale or rent to those on the lower spectrum of earnings. Some states are doing better than others in this regard. Here's an infographic that demonstrates this.
This, of course, is just a single snapshot. If you'd like to know more, visit their website: www.nlihc.org
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