What he was describing was clearly interest. 1) Someone wants to build something that costs 100 BTC to build. 2) He asks someone with 100 BTC to borrow the money. 3) They give him the money and he promises to return the entire 100 BTC and add 1% on top. 4) He spends X years building. 5) He finishes, gets 101 BTC and returns it. 6) Lender pockets 1% profit. My point was: Where does the 101 Bitcoin come from, that he pays back? How hard is it to scrape together 101 Bitcoin after X years (when the purchasing power has increased), while building something? Under fiat, he simply takes out a different loan to repay the 101 Bitcoin and then he just keeps rolling that debt over into longer and longer-dated loans and other financial magic. Or he has a huge stock sale to astronomic prices. Or etc.