Yeah, a ponzi scheme bases on exponential growth and if you know the fake dividend size as well as the size of your economy, you can create upper limits for its

Yeah, a ponzi scheme bases on exponential growth and if you know the fake dividend size as well as the size of your economy, you can create upper limits for its lifetime, while speculative asset bubbles are different. They don't give guarantees about paying the dividend at some fixed date, so can remain overvalued for way longer times. That's the same problem that the crypto currencies have. No lie to keep up that you get dividends in terms of dollars, means less solvency issues to be solved by the person charged with keeping up the bubble (if it's even an individual doing it, usually ponzis have one person or individual at the center while bubbles can have many actors). Just spreading HODL mentality as well as optimism is enough.