As a practical matter, without government to to enforce contracts and protect IP, most of the monopolies we've seen over the last ~120 years or so would never have existed. There would not have been much to MSFT if software piracy were a nonissue at the corporate level.
Without rules I think you'd see a lot more violence. They'll get their way domestically, in the same way large enterprise has leveraged violence the world over to get their way.
Someone has to have a monopoly on violence or you're going to have a bad time.
