An FAQ for Libertarians/Chamberlain
From Critiques Of Libertarianism
Nozick suggests that if everybody at a basketball game volunteered to pay Wilt Chamberlain a small amount of money, the end result would be a vastly unequal income distribution, but since everybody had donated ‘voluntarily,’ there would be no problem regarding the justness of the outcome. But while it is true that everybody at the basketball volunteered to donate their own money, it is not true that they agreed to anyone else donating money, and it is certainly not true that they all agreed to everyone collectively donating a fortune. The principle is actually based on a subtle switch from individually voluntary choices to collectively voluntary ones, one which doesn’t hold up to scrutiny.
UnlearningEcon, "An FAQ for Libertarians"