This is a four-item, five-point Likert-type scale that measures the degree to which a person believes TV commercials are a good way to learn about a product's social aspects, with an emphasis on who appears to use it.
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The Marketing Scales Handbook is indispensible in identifying how constructs have been measured and the support for a measure's validity and reliability. I have used it since the beginning as a resource in my doctoral seminar and as an aid to my own research. An electronic version will make it even more accessible to researchers in Marketing and affiliated fields.