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The elites in the City of Chicago and the local labor unions don't like Wal-Mart. I bet it is partly because it doesn't look nice, it's beneath the elites too and it puts pressure on unions to be competitive. It doesn't matter that it means more good entry level (and better) jobs and affordable prices for the citizens as well.
Don't be poor and in the City of Chicago. You must be rich and able to afford more pricey commodities. You must be among the elite of union membership (let's keep our guild small and strong so those lucky enough to be in it make a lot of money - to heck with the poor). It's a strategy that has worked in San Fransisco where few of those troublesome poor can afford to live in most areas of the City and taint the elites there.