A Ponzi scheme is an investment fraud that involves the payment of purported returns to existing investors from funds contributed by new investors. Ponzi scheme organizers often solicit new investors by promising to invest funds in opportunities claimed to generate high returns with little or no risk. In many Ponzi schemes, the fraudsters focus on attracting new money to make promised payments to earlier-stage investors to create the false appearance that investors are profiting from a legitimate business.
With little or no legitimate earnings, Ponzi schemes require a consistent flow of money from new investors to continue. Ponzi schemes tend to collapse when it becomes difficult to recruit new investors or when a large number of investors ask to cash out.
All of the above from https://www.sec.gov/fast-answers/answersponzihtm.html
Can demography change people’s perception? The link below deals with the demographic effect on the pay as you go retirement systems.
Is it really true that demography only affects pay as you go systems? the more you study, the more you doubt.