Machiavellian personality traits can be measured and validated experimentally

Evidence

The issue of clarity is partly addressed in Christie and Geis’s (1970) work on machiavellianism. Over a number of years they developed a personality questionnaire which was designed to rate individuals as either more or less cunning, manipulative, and unscrupulous in their relations with other people. They attempted to validate the scale in a variety of ways, including a laboratory game called the Con Game. — Diego Gambetta, Trust - Making and Breaking Cooperative…, 584

Categorization

• XREF: The unscrupulous profiting from ambiguity anticipates who thrives once blindness removes observability — the opportunistic types in Saramago’s quarantine.