For some areas they provide opportunity. For others they destroy competition and lower the quality of life for any unskilled workers in the area.

If the quality of life is lowered in places where they exist, they would soon be out of business. I don't shop at Wal-Mart, but plenty of folks do. That's why they're successful.

And I still have not seen one example of a person being hired for a meaningful, economic job by a poor person.

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"Victory at all costs, victory in spite of all terror, victory however long and hard the road may be; for without victory, there is no survival."
Winston Churchill