http://www.mises.org/journals/qjae/pdf/qjae10_4_1.pdf
I read this a while back as I did, for a time, subscribe to the QJAE. He formulates the argument on purely essentialist grounds basing it on Rothbard's monopoly theory. Using this he shows that any any purely free market all persons and firms can rationally calculate; so charities and other non-profit organisations can be rational not just profit maximising firms. He also uses his theory to account for the existence of firms: that of the intellectual division of labour.
Check it out.
The atoms tell the atoms so, for I never was or will but atoms forevermore be.
Yours sincerely,
Physiocrat
That was just excellent. One of the best papers regarding that issue.