I know that in many towns, the introduction of a superstore meant the local businesses weren’t doing as well. This is a problem that can only really be solved by the local people when they stop buying every last thing from the supermarket. This usually only happens in places that aren’t very busy, but as long as smaller businesses keep up a very good reputation and have good customer service, there shouldn’t be many big issues.
I can definitely understand why jobs might be lost though.