Wikipedia's definition isn't cannon:
http://www.sec.gov/spotlight/enf-actions-ponzi.shtmlIf I promise you something for amount XYZ and I need a future investor to deliver it and then another another for that investor, I have committed fraud. You can code it anyway you like, it isn't self-sustaining nor ends well for the vast majority of people involved.
But I'm done with this debate. I've had my say and so did Josh. I won't post in this thread anymore.