links to Murray Rothbard's "Children & Rights" multiple times on here.
https://mises.org/library/children-and-rights
He and his sycophants have expounded upon how much better the free market would be rather than having the state interfere and force people to go through adoption agencies.
Here is an excerpt from one of his posts:
http://www.tigerboard.com/boards/view.php?message=15483415
"In the libertarian society, then, the mother would have the absolute right to her own body and therefore to perform an abortion; and would have the trustee-ownership of her children, an ownership limited only by the illegality of aggressing against their persons and by their absolute right to run away or to leave home at any time. Parents would be able to sell their trustee-rights in children to anyone who wished to buy them at any mutually agreed price."