Jobs are always most concentrated in high cost area, such as urban area.  Cost of living is always lower in suburban where jobs are fewer and more sparse.  Poor people by virture of being many, need to work in high cost area and live in a low cost area.  Efficient public transit from suburban to urban can help.

Canadians, however, do not like this kind of public transit （e.g. Scarborough subway) and always whine why high cost area is so high cost, and why low cost area does not have job.