The optimal amount of fraud is non-zero

Trust, though, is an immensely socially useful technology. Human civilization has a fundamental limitation in that all humans can be trivially killed while sleeping. Huge portions of society’s efforts go toward establishing conditions where this trivial vulnerability virtually never gets exploited. God has, reportedly, closed all bug reports claimi... See more

All fraud is a) an abuse of trust causing b) monetary losses for the defrauded and c) monetary gain for the fraudster. You could zero fraud by never trusting anyone in any circumstance.