Suppose walden pond is a common-property resource—anyone can fish without having to pay for access. swan lake is privately owned—people who want to fish must purchase one of a limited number of permits from the lake's owner each season.

well it depends i think people around the world are coming around to gay marriage. but if you are talking abortion then wow, so much to talk about. such as men thinking they have the right to choose if women can, the fact there are health concerns if the women can't get one, and many more arguments to discuss. so i would definitely say abortion would be a much more interesting topic.