Expetativa razoável

Knowingly entering a Ponzi scheme, even at the last round of the scheme, can be rational economically if there is a reasonable expectation that government or other person or organisation will bail out those participating in the scheme.

in Wikipedia, citando Bhattacharya, Utpal (2003). "The optimal design of Ponzi schemes in finite economies". Journal of Financial Intermediation 12: 2–24