https://www.stlouisfed.org/dialogue-with-the-fed/the-possibilities-and-the-pitfalls-of-virtual-currencies/videos/part-4-how-big-is-bitcoin-and-is-it-stable
How Big Is Bitcoin, and Is It Stable? | Dialogue with the Fed | St. Louis Fed
David Andolfatto explains some of the benefits and drawbacks to virtual currency.
dialogue with the fedhow big is