I think it's more about how the economic system is structured and how the government taxes corporations. In Germany for example there are a bunch of very large

I think it's more about how the economic system is structured and how the government taxes corporations. In Germany for example there are a bunch of very large corporations that "dominate" their local communities in terms of employment (Bosch for example has 130.000 employees in Germany alone and 400.000 around the world!) and the regions where those companies are concentrated are among the wealthiest in Europe. Of course you need to make sure that companies don't privatize all the profits without giving back something to the community, but that's (IMHO) not an issue of company size but rather a taxation issue.