New Orleans reduced homelessness by 90% (and saved a fortune) by giving homeless people homes

Homelessness in New Orleans spiked after Hurricane Katrina, reaching 11,600 by 2007; today that number has been reduced by 90%, thanks to a "housing first" (previously) approach that starts by giving homeless people stable, permanent housing, and then addressing confounding factors like mental illness and substance addiction (on the grounds that these conditions are easier to treat when people have stable housing).
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