I did, perhaps not in that particular post, but it's the crux of the arguement. The question is, how does money have any value. If you're saying it's value is simply set by people deciding that it's valuable, that implies that it would be impossible to be in error about it's value. Even if bought a bottle of water for $2, and there was another bottle for $1 around the corner, $2 is worth a bottle of water, because I just set it's value. This contridicts the clear reality that it is possible to be wrong about something, which you pointed out. What I'm saying is that money is fundementally different from bottles of water. Bottles of water may be fundementally valuable to you, money is only valuable to you based on assumptions that must continue to hold true. The assumption is that other people value it, but they don't. They only value it because you value it, you only value it because they value it. The whole value of the dollar is based entirely on perception of value, it has no real value to anyone.