olemus
üks kelmuse liike: ärimudel, milles
varajaste osalejate tulu ainus või peamine allikas
on järgmiste liitunute sissemaksed ning mis seetõttu
põhineb üha uute maksete juurdemeelitamisel;
paljudes maades on ebaseaduslik

Oxford Languages:
a form of investment (illegal in the UK and elsewhere) in which each paying participant recruits two further participants, with returns being given to early participants using money contributed by later ones

ülevaateid
https://corporatefinanceinstitute.com/resources/knowledge/other/pyramid-scheme/

https://ag.ny.gov/consumer-frauds/pyramid-schemes

https://en.wikipedia.org/wiki/Pyramid_scheme

https://www.cba.am/Storage/EN/FDK/Annual%20Reports/Analysis_on_pyramids_eng.pdf

tõrje
https://www.wikihow.com/Avoid-a-Pyramid-Scheme

https://www.actionfraud.police.uk/fraud_protection/pyramid_schemes