Watching this ASAP. Before I do though, I fully agree. How on earth would they be able to generate "yields" with a finite supply? It's simply impossible and whoever says the opposite is either an idiot or a crook. I don't care who it is. 

 Saylor doesn’t say. Presumably from the fiat system because he definitely knows about the 21M hard cap. He doesn’t want to reckon with the reality though and gets annoyed that Saif holds the line of rationality.