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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

Purchase Urgency

The scale measures the extent to which a consumer believes the availability of an advertised product is limited (quantity or time) and is motivated to purchase one before others do.  Three, seven-point Likert-type items compose the scale.  Aggarwal, Jun, and Huh (2011) referred to the measure as consumer competition.