"Okay, this is probably going to get metaphysically complicated."
"Changing whether you have 0G, or whether anyone besides me has non-zero G, might possibly be way more difficult than making an arrangement where I hold G and consider some of that G to be yours. What we did with the tacos and the crate didn't violate... the kind of physics that doesn't depend on anyone's choices. There's probably some level of reality that thinks you aren't supposed to 'buy' tacos with your fixed 0G and then just give them to me, but it's something you can do as a choice. Having more than 0G directly inside your own existence may not be something you can do as a choice. It may just be how the world works."
"This town could still have money that behaved like money, it would just need to be... not G, because the world already thinks it knows how G works and that you're supposed to have 0 of it no matter what you buy or sell. We'd need to make that money out of our own choices."