I just think we've followed different lines of reasoning, rather than I'm arguing in bad faith. I sure wish someone were paying me to mislead people online! I do think that markets in the past have included slaves, and in fact Graeber dedicated a good bit in Debt to describing how early Islam's forbiddance of usury improved markets to the point that heroic stories about merchants started circulating around, because markets stopped being nothing but horrible slave trading galleries.
Another question might be what if voluntary agreements include stockpiling weaponry, and military training, and lobster dinners? The soon-to-be-invaded might want to interfere with that freedom. How about voluntary agreements, where you're agreeing to pay rent to the landlord so that his police don't throw you out on the streets? Those are definitely the source of the Trump family wealth, which I'd prefer they were a little less free to consolidate.
I just don't think "voluntary agreement" is sufficient to get rid of all the awful stuff in society. Everything is voluntary until it isn't.
CC:
@[email protected]