The MACH-IV Scale
https://openpsychometrics.org/tests/MACH-IV/
Introduction Niccolò Machiavelli was an Italian politician and philosopher in the Renaissance who is famous for his advocacy of political ethics that views effectiveness as more important that morality. He is the source of the phrase "the ends justify the means". In the 1960s, social psychologists Richard Christie and Florence L. Geis collected statements from Machiavelli's writings and asked people how much they agreed with each. From their research they concluded that Machiavellianism exists as a distinct personality trait. They published the MACH-IV to measure this trait in 1970 and it has been a popular instrument ever since and correlates with many things.
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