So given what you guys are saying, and upon reflection, I think you're right, nomadzophiel, that the mechanics of barter in the game reflect this multiplicity of economic modes pretty well -- even if "barter" as a word might be a little confusing.
The Nobilis hack thing sounds awesome and makes a lot of sense in a feudal context. But I'd argue that Graeber and his anthropologist buddies are arguing that when "social connections has collapsed and sense of obligations and debt cannot be trusted", spot-transaction barter works even worse. Because without a standard of currency, you are just hella unlikely to have the precise thing the other guy wants in that moment. You're a skinner and you walk up to the guy with the moose carcass and you say "I will perform one dance for you for a pound of that meat", and 90% of the time the guy is going to say "fuck that, I don't need a dance". The savvyhead would like a dance and has fixing skills to trade for it, but the skinner doesn't have anything he wants fixed. Spot-tansaction barter is so terrifically inefficient that if you rely on it in that context, you'll starve. Instead, the skinner is going to go to the hardholder and say, "I dance. Use me" and the hardholder doesn't care much for dancing but wants to keep the savvyhead happy because shit's always breaking down and can just order the guy with the moose carcass to fucking give the skinner some and so the hardholder says, "okay. you're mine." That is 1-barter in mechanical terms in AW and AW's barter scales beautifully to cover it. But it's not actually literally barter in terms of the social relationships and consequences, and that's kind of illuminating. There's actually hella debt involved. The skinner is in no position now to say "okay, you had your thirty-three dances, I've been fed for a month, we are quits." He can make that argument in general terms -- "I've done a lot, I love you but I want to move on, surely I've paid you what I owe you for helping me, and surely you want me to spread the fame of your hold, so let me leave" -- but it's not smoothly quantifiable, with an invoice for services rendered.
I don't think it's "social connections has collapsed and sense of obligations and debt cannot be trusted" -- on the contrary. I think in our cushy happy world, you can trade a certain number of dollars for a certain thing, kaching kaching, and walk out of the store happily finished with the transaction. I think in AW you don't survive long unless you think not just about the transaction but about WHO you're dealing with and what it means, what you're getting yourself into. To ignore the question of "who can I trust?" is suicidal and the fact that the ultimate answer is "noone" (at least until you roll a 12+ on advanced seduce & manipulate) doesn't help much, because the question is "who can I trust most for right now, given that I have to trust someone?" Short of magically happening to always having-the-thing-that-the-person-who-has-the-thing-you-want wants, or functioning law/authority/currency (of which, sure, there are pockets), trust is all you've got.
But as I said, AW's barter mechanic actually covers this handily. One thing that really helps is its granularity. 1-barter isn't a meal: it's a *month* of meals. That suggests that no one walks into the Maestro D's establishment and says "I'd like a plate of stew, what will it cost me?" The answer to that question is "who the fuck are YOU?"
If you're the hardholder, it costs you nothing, sir, and how's arranging that security detail going? If you're the nearby peasant who's been bringing in my potatoes like you're supposed to, it costs you nothing, but you're not getting the good stuff, obviously, and if you're the peasant who's been slacking off, fuck you, get out of my place. If you're the Operator, and I trust you, then okay, let's talk, maybe we can work something out -- but it's hardly worth doing so for ONE plate of soup. The plate of soup is going to be on the house if I think you REALLY can set me up with access to fresh plums, reliably. And if you're some stranger I've never seen before, who has some oddments you salvaged that you want to trade for a bowl of stew, first of all, my crew's guns are out while we're having this conversation, and second, okay, I'll look at your shit and see if *I* happen to need it right now, but really, you should be finding a place in this little social system of ours and convince us to trust you, or move the fuck on, or else you're going to end up dead.