Not quite. It settles when supply and demand come roughly into balance over time. Think of a stock trading sideways; you'll get the idea. Then, someone can can be decided that "okay, today is the day."
I'm glad to issue the clarification. You'll find that many Freepers are well-versed in economics, so they use terms like "at the margin" like they're part of ordinary English. I'm sure you'll pick it up as you go along.
As far as digital gold and whatever...wow. Yeah, I'm behind the times, and from what I hear, I don't like the idea at all.
Even if Rick Perry get behind it? :)