It's the main point of the (excellent) book "Lying for Money: How Legendary Frauds Reveal the Workings of Our World" by Dan Davies: That the optimal amount of f

It's the main point of the (excellent) book "Lying for Money: How Legendary Frauds Reveal the Workings of Our World" by Dan Davies: That the optimal amount of fraud is above zero. The optimal amount is the one where you lose less value from fraud than you would have lost with overly-strict checks and false positives.