I think Rothbard does a good job to explain how "corporations" should exist in the free market, but corporations as they are now, as everybody understands them, are completely state institutions.
- They exist by permission of the state.
- The limited liability shortfall is backed up by the state(think BP oil spill. How many tax dollars were spent cleaning up that mess? In a free market, BP wouldn't have likely even been able to drill without a bond that covered a huge oil spill cleanup.)
- They fink out unlicensed competitors to the state.
- They get subsidies from the state.
- They pay the state protection money.
- They lobby the government for protectionist laws to squish competition.
- Historically, corporations were chartered by the government in order to do things, including facilitating trade, building bridges, etc. When their task was done, they were often disbanded. But then things eventually changed allowing them to exist in perpetuity.
I will say, however, that in the dailypaul link provided he mentioned that people don't believe the corporations should be allowed to exist. I wouldn't quite put it that way, because that implies that the government should put an end to the corporations. I don't believe that. As a non-voting political-atheist I take no position on what the criminal organization known as the state should or should not do.
But I do recognize a state entity when I see one.
http://www.thefreedictionary.com/corporationcor·po·ra·tion
n.
1. A body that is granted a charter recognizing it as a separate legal entity having its own rights, privileges, and liabilities distinct from those of its members.
2. Such a body created for purposes of government. Also called body corporate.
3. A group of people combined into or acting as one body.
In the first definition we can clearly see that a body that is granted a charter is granted by the government.
In the second definition we can also clearly see that corporations are government bodies.
The third definition is non-statist, but clearly none of the modern, legal corporations that exist now fit definition 3 but NOT definitions 1 or 2 as well. Only a corporation that fits definition 3, and only definition 3, is a free-market friendly corporation.