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The Marketing Scales website is a gold mine of information.  It is the only source that helps me understand the psychometric quality of the instruments used in past research.  I recommend that researchers bookmark this site . . . they will be back!
Bob Moritz
Marshfield Clinic Research Foundation

Self-Confidence (Persuasion Knowledge)

Six Likert-type statements are used to measure one's familiarity with the persuasion tactics used by marketers to sell products and having confidence in one's ability to deal with those tactics.