I don't have much time to comment on this (I'm just about out the door) but selling babies is a bad idea. Those who have the money to do it, are are materialistic enough to actually become party to buying humans, wouldn't be buying the children of the poor, whom they would regard as off-brand, possibly coming from doper fathers and unhealthy mothers who probably have diabetes and haven't been taking their prenatal vitamins. They'd be buying babies from healthy white college students and willing to pay the premium price. Adoption only works to the good of the child if the child is adopted because of the
child's personal dignity and human need, not because of the
adult's wants or demands or yen for a lifestyle accessory.
Further promoting the modern babies-are-property trend is a very, very bad idea.
I understand the argument
against selling babies. The problem with Posner is that when you read him, you find yourself nodding in agreement at some point. When you realize you're nodding in agreement you often have a moment of panic.
Maybe I can find an article by Posner on the issue, rather than a book.
Posner's theories are all based on a concept he pioneered called 'wealth maximization' - an economic theory that he says results in the best and most ethical operation of social institutions.
Here's a book review on one of the many books he's written on the subject of wealth maximization.