Small businesses result in innovation. There is little innovation from big business whose entire mission becomes profit maximization once sufficiently large enough. The little guys are that ones that come with new ideas and move fast to grow it. This is the entire story of startups in the US, silicon valley and more.

Big business also drives down wages way more than small businesses. When you are one of the few major employers in an industry, there is zero need to pay more while sucking in profit. Sure, maybe you could get an union involved but you are still subservient to the same employer who no longer has to respond to any labor market pressure other than quelling the union once in awhile.