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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

Reciprocity Motivation (Self-Interest)

Four, seven-point Likert-type items measure a customer’s belief that his/her relationship with a particular service firm is such that the parties look out for their own interests first and foremost.