If we define "pyramid-Ponzi scheme" is that the value goes up if more people talk about and buy it, then every asset is a pyramid-Ponzi scheme. Startup shares,

If we define "pyramid-Ponzi scheme" is that the value goes up if more people talk about and buy it, then every asset is a pyramid-Ponzi scheme. Startup shares, lottery tickets, stocks, US dollars, oranges, everything. It's not a very useful definition.