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I really appreciate your marketing scales database online. It is an important resource for both our students and our researchers as well. Since my copies of the original books are slowly disintegrating due to the intensive use, I am happy that you are making them available in this way. It is very helpful in the search for viable constructs on which to do sound scientific research.
Dr. Ingmar Leijen
Vrije Universiteit University, Amsterdam

parity

With three, seven-point Likert-type items, the scale measures a consumer’s general belief that brand name products in a certain product category are essentially the same as those brands owned by the store.  (How they are viewed as “the same” is not stated in the items.)

The extent to which a person, such as a viewer or consumer, believes that he/she is similar to the person who created a particular ad is measured using three, seven-point items.

Three, nine-point Likert-type items are used to measure the degree to which a consumer believes that a particular brand is different from other brands. Zhou and Nakamoto (2007) referred to the scale as perceived differentiation.

The four, five-point Likert-type statements measure the degree to which a person believes the services provided by competing providers in an industry vary a lot in their quality. If reversed from the way the items are shown being scored (below), the scale could be considered a measure of parity.

Four seven-point Likert-type statements are used to measure the degree to which a customer believes there are acceptable alternative sources of a product. Although the scale was developed for use with a service provider it would appear to be amenable for use with sellers of physical goods as well. The measure was called attractiveness of alternatives by Jones, Mothersbaugh, and Beatty (2000).