Food deserts on Chicago's South Side have shrunk some since 2006, and this has provided health benefits to the communities.

The Food Stamp Challenge, which challenges higher-income families to live as if they are on food stamps, estimates that a person on food stamps has a budget of about $1.25 per meal. In other words, a family on food stamps must buy an entire meal per person for less than the cost of an average cup of coffee.

Wal-Mart's slogan 'Save money, live better' promises a lot. So does its entrance into Chicago.

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