Well, however you feel about Walmart personally, they do pay rather low wages and they have a tendency to replace other businesses in the area...

I went to college in Cedar Falls, IA, where they moved the regular Walmart and built a Super-Walmart (despite local residents objecting). The building where the old Walmart stood has been vacant for several years, it's a big eye sore but Walmart really couldn't care less because they have plenty of customers at the new one... just trying to give you an idea. If it were my project, I would photograph the old building and the new one and highlight the fact that Walmart leaves a trail of devastation behind them...haha, ok, dramatic, I know.