Walmart is notorious for decimating local small businesses. A couple of years ago, they were trying to open stores in our town as well as a neighboring town. Their MO is to open two stores near each other, wipe out local competition, then close one of the stores, often crushing the local economy. When they couldn't get the zoning approvals in our town, they abandoned both locations.
Caveat: everything I've written is (at best) second hand info, and I have no evidence with which to back it up.
"It does me no injury for my neighbour to say there are 20 gods or no god. It neither picks my pocket, nor breaks my leg."
-- Thomas Jefferson