Earlier quoted context omitted.
The corporation (that runs internally as a planned economy) will get more and more inefficient the larger it gets, because that is what planning an economy does. Which in turn means it will loose market share and be forced to lean up until it is competitive again.
Or it just uses its power to influence government regulations and suppress or buy out competition. Like what one of the current crop of mega corps has an internal market for how its capital is allocated. The closest example I could think of in history was IBM and its blue dollars.
Mind you, not different, or "better" intervention, but less, or even none at all. One could argue the point about libertarianism is that you can't trust the government to do a good job because it is based on force, and not voluntary market interactions, and hence lacks the proper incentives. It's just a bunch of guys on a spending spree with other peoples money, and their incentive is to make as much of it as humanly possible land in their own pockets.