USDA

The "food deserts" problem is receiving heightened attention following the release of the USDA's locator map. But this analysis relies on the suspect premise that suburban supermarkets are superior to small, walkable urban foodsellers.

A little-known USDA program offers Rural Development Guaranteed Loans, which would allow low-income residents to buy homes in "rural" areas--places with fewer than 25,000 people. Under this guideline, many suburbs in Phoenix qualify.