[thevagrant]

I don't know answer but these spring to mind: Debt, overtime, multiple jobs, overcrowding, subletting rooms.

[DoreenMichele]

America also has a lot of homelessness. Yes, there are homeless people with jobs, contrary to what most people seem to think.

[ravenstine]

People underestimate the percentage of homeless who live in their cars and shower at the gym, and aren't just the unwashed "bums" sleeping on benches.

[Ekaros]

That is one solvable group, they just need reasonably priced housing in reasonable locations. The mentally ill and substance abusers(including alcohol), is much more complex issue.

And then there is probably small group you will never house, because they prefer to be homeless. Still doesn't mean the two other groups should not be solved. It is just that there is no political will to build enough housing or solve the systematic issues.

[incone123]

Also people who are street homeless or living in their cars, but in many cases still holding down jobs.