First off, slavery existed in the Icelandic commonwealth, which was an ancap system, so that's false right out of the gate.



You seem to misunderstand the basic critique of exploitation that has guided anarchists and their brethren from the beginning- that the exploitation is systemic. You can't look at it as a reductionist, as you are doing and as I once did back when I, first drawn to individualist anarchism, thought that 'anarcho'-capitalism was the way to go. You have to look at it contextually. The system as a whole is flawed. While no individual capitalist is necessarily to blame, the fact remains that there exists a class of people who own the means of production, and because they own the means of production, are entitled to the labor of those who work the means of production. There exists likewise a class of people who, lacking the means of production, must work the means of production, but do not get the full value of their labor. That value is the profit- the value that their labor has added to the product.



I don't mean to say that there is an intrinsic value, but rather that, in the context of the society, the forces of supply and demand (what is available and what the society needs) determines the value that labor adds to a product. If I labor to grow potatoes during a famine, obviously, the value I have added, in the context of the famine, is much greater than the value I have added in the context of, a time of great abundance. Whatever that value added, though, the source of the value is the same- labor. In the capitalist system, those who own stock in the means of production gain the profit, the value added by the labor performed, even when they do not contribute. This takes away the meaningful exercise of self-ownership from the people who, having no means of production, must work for others. The result of this system is the creation of a class hierarchy, the disenfranchisement of a great many people, and the root of social antagonism that, left unchecked by the monopoly of violence of the State/Capitalist alliance, would explode from anarchy to anomie.



Because anarchists are opposed to all hierarchy, whether it is by state, patriarchy, race, class, or any other distinction, we must oppose this system. The fact that one can, rarely, move up or down the hierarchy from the position of exploited to exploiter, or can choose a different master, does no more to erase the hierarchy than the State's offer of allowing us to choose our governors. The opposition to capitalism has been at the core of our ideology, including the ideology of individualist anarchists, since the movement began.



I am not arguing against markets. I support markets, and the right of people to choose whether to sell their products on a market or join some sort of federation of communes, syndicates, or gift economies. I am not arguing against the concept of use rights (property). I am arguing against the systemic stratification of society between workers and owners, and making the claim that it is more exploitative to continue with capitalism, than it would be to switch to a system whereby property rights to productive property such as land and factories is based on possession and use.