Brand extension or brand stretching is a marketing strategy in which a firm marketing a product with a well-developed image uses the same brand name in a different product category. The new product is called a spin-off. Organizations use this strategy to increase and leverage brand equity (definition: the net worth and long-term sustainability just from the renowned name). An example of a brand extension is Jello-gelatin creating Jello pudding pops. It increases awareness of the brand name and increases profitability from offerings in more than one product category.
A brand's "extendibility" depends on how strong consumer's associations are to the brand's values and goals. Ralph Lauren's Polo brand successfully extended from clothing to home furnishings such as bedding and towels. Both clothing and bedding are made of linen and fulfill a similar consumer function of comfort and hominess. Arm & Hammer leveraged its brand equity from basic baking soda into the oral care and laundry care categories. By emphasizing its key attributes, the cleaning and deodorizing properties of its core product, Arm & Hammer was able to leverage those attributes into new categories with success. Another example is Virgin Group, which was initially a record label that has extended its brand successfully many times; from transportation (aeroplanes, trains) to games stores and video stores such a Virgin Megastores.
In the 1990s, 81% of new products used brand extension to introduce new brands and to create sales. Launching a new product is not only time consuming but also needs a big budget to create awareness and to promote a product's benefits. Brand extension is one of the new product development strategies which can reduce financial risk by using the parent brand name to enhance consumers' perception due to the core brand equity.
While there can be significant benefits in brand extension strategies, there can also be significant risks, resulting in a diluted or severely damaged brand image. Poor choices for brand extension may dilute and deteriorate the core brand and damage the brand equity. Most of the literature focuses on the consumer evaluation and positive impact on parent brand. In practical cases, the failures of brand extension are at higher rate than the successes. Some studies show that negative impact may dilute brand image and equity. In spite of the positive impact of brand extension, negative association and wrong communication strategy do harm to the parent brand even brand family.
Product extensions are versions of the same parent product that serve a segment of the target market and increase the variety of an offering. An example of a product extension is Coke vs. Diet Coke in same product category of soft drinks. This tactic is undertaken due to the brand loyalty and brand awareness they enjoy consumers are more likely to buy a new product that has a tried and trusted brand name on it. This means the market is catered for as they are receiving a product from a brand they trust and Coca Cola is catered for as they can increase their product portfolio and they have a larger hold over the market in which they are performing in.
Types of brand extension 
Brand extension research mainly focuses on consumer evaluation of extension and attitude toward the parent brand. In their 1990 model, Aaker and Keller provide a sufficient depth and breadth proposition to examine consumer behaviour and a conceptual framework. The authors use three dimensions to measure the fit of extension. First, the “Complement” refers to consumers taking two product classes (extension and parent brand product) as complementary in satisfying their specific needs. Secondly, the “Substitute” indicates two products have the same user situation and satisfy the same needs, which means the product classes are very similar and that the products can act to replace each other. Lastly, the “Transfer” describes the relationship between extension product and manufacturer which “reflects the perceived ability of any firm operating in the first product class to make a product in the second class” The first two measures focus on the consumer’s demand and the last one focuses on the firm’s perceived ability.
From the line extension to brand extension, however, there are many different types of extension such as "brand alliance", co-branding or “brand franchise extension”. Tauber (1988) suggests seven strategies to identify extension cases such as product with parent brand’s benefit, same product with different price or quality, etc. In his suggestion, it can be classified into two category of extension; extension of product-related association and non-product related association. Another form of brand extension is a licensed brand extension. In this scenario, the brand-owner works with a partner (sometimes a competitor), who takes on the responsibility of manufacturing and sales of the new products, paying a royalty every time a product is sold.
Categorisation theory 
Researchers tend to use “categorisation theory” as their fundamental theory to explore the effects of brand extension. When consumers are faced with thousands of products to choose amongst, they are not only initially confused, but try to categorise by brand association or image given their knowledge and previous experience. A consumer can judge or evaluate the extension product with his or her category memory. Consumers categorise new information into specific brand or product class label and store it. This process is not only related to consumer’s experience and knowledge, but also involvement and choice of brand. If the brand association is highly related to extension, consumer can perceive the fit among brand extension. Some studies suggest that consumer may ignore or overcome the dissonance from extension especially flagship product which means the low perceived of fit does not dilute the flagship’s equity.
Brand extension failure 
Literature related to negative effect of brand extension is limited and the findings are revealed as incongruent. The early works of Aaker and Keller (1990) find no significant evidence that brand name can be diluted by unsuccessful brand extensions. Conversely, Loken and Roedder-John (1993) indicate that dilution effect do occur when the extension across inconsistency of product category and brand beliefs. The failure of extension may come from difficulty of connecting with parent brand, a lack of similarity and familiarity and inconsistent IMC messages.
“Equity of an integrated oriented brand can be diluted significantly from both functional and non-functional attributes-base variables”, which means dilution does occur across the brand extension to the parent brand. These failures of extension make consumers create a negative or new association relate to parent brand even brand family or to disturb and confuse the original brand identity and meaning.
In addition, Martinez and de Chernatony (2004) classify the brand image in two types: the general brand image and the product brand image. They suggest that if the brand name is strong enough as Nike or Sony, the negative impact has no specific damage on general brand image and “the dilution effect is greater on product brand image than on general brand image”. Consequently, consumers may maintain their belief about the attributes and feelings about parent brand, however their study does show that “brand extension dilutes the brand image, changing the beliefs and association in consumers’ mind”.
The flagship product is a money-spinner to a firm. Marketer spends budget and time to create maximum exposure and awareness for the product. Theoretically speaking, flagship product is usually had the top sales and highest awareness in its product category. In spite of Aaker and Keller’s (1990) research which reports that prestigious brands are not harmed from failure of extensions, some evidence shows that the dilution effect has great and instant damage to the flagship product and brand family. Still, some studies suggest that even though overall parent belief is diluted; the flagship product would not be harmed. In addition, brand extension also “diminish[es] consumer’s feelings and beliefs about brand name.” To establish a strong brand, it is necessary to build up a “brand ladder”.
Marketers may follow the order and model created by Aaker and Keller who are authorities on brand management, but branding does not always follow a rational line. One mistake can damage all brand equity. A classic extension failure example would be Coca Cola launching “New Coke” in 1985. Although it was initially accepted, a backlash against “New Coke” soon emerged among consumers. Not only did Coca Cola not succeed in developing a new brand but sales of the original flavour also decreased. Coca Cola had to make considerable efforts to regain customers who had turned to Pepsi cola.
Although there are few works about the failure of extensions, literature still provides sufficient in depth research around this issue. Studies also suggest that brand extension is a risky strategy to increase sales or brand equity. It should consider the damage of parent brand no matter what types of extension are used.
Brand equity 
Brand equity is defined as the main concern in brand management and IMC campaign. Every marketer should pursue the long term equity and pay attention to every strategy in detail. Because a small message dissonance would cause great failure of brand extension. On the other hand, consumer has his psychology process in mind. The moderating variable is a useful indication to evaluate consumer evaluation of brand extension.
Throughout the categorisation theory and associative network theory, consumer does have the ability to process information into useful knowledge for them. They would measure and compares the difference between core brand and extension product through quality of core brand, fit in category, former experience and knowledge, and difficulty of making. Consequently, in this article may conclude some points about consumer evaluation of brand extension:
- Quality of core brand creates a strong position for brand and low the impact of fit in consumer evaluation.
- Similarity between core brand and extension is the main concern of consumer perception of fit. The higher the similarity is the higher perception of fit.
- Consumer’s knowledge and experience affect the evaluation before extension product trail.
- The more innovation of extension product is, the greater positive fit can perceive.
A successful brand message strategy relies on a congruent communication and a clear brand image. The negative impact of brand extension would cause a great damage to parent brand and brand family. From a manager and marketer’s perspective, an operation of branding should maintain brand messages and associations within a consistency and continuum in the long way. Because the effects of negative impact from brand extension are tremendous and permanently. Every messages or brand extension can dilute the brand in nature.
Notes and references 
- Keller, K.L. (1998), “Strategic Brand Management: Building, Measuring, and Managing Brand Equity”, Prentice-Hall International, Hemel Hempstead.
- Tauber, E.M. (1981), “Brand franchise extensions: new products benefit from existing brand names”, Business Horizons, 24(2), pp. 36-41.
- Muroma, M. and Saari, H (1996), “Fit as a determinant of success”, in Beracs, J., Baure, A. and Simon, J. (Eds), Marketing for Expanding Europe, Proceedings of 25th Annual Conference of European Marketing Academy, pp. 1953-63.
- Chen and Liu 2004. (incomplete citation)
- Aaker,D.A.(1990),“Brand extensions: ‘the good, the bad, the ugly’”, Sloan Management Review, pp. 47-56.
- Martinez and Pina, 2003
- Loken and John, 1993
- Roedder-John, D., Loken, B. and Joiner, C. (1998), “The negative impact of extensions: can flagship products be diluted?”, Journal of Marketing, 62 (1), pp. 19-32
- Aaker, 1990; Tauber, 1981; Tauber, 1988.
- Henderson and Quandt, 1980.(incomplete citation)
- Aaker and Keller, 1990, p30. (incomplete citation)
- Rao and Ruejert, 1994.(incomplete citation)
- Milberg, S.J., Park, C.W. and McCarthy, M.S. (1997), “Managing negative feedback effects associated with brand extensions: the impact of alternative branding strategies”, Journal of Consumer Psychology, 6(2), pp. 119-40.
- Tauber, 1981, p.36.
- Tauber, E.M. (1988), “Brand leverage: strategy for growth in a cost-controlled world”, Journal of Advertising Research, 28, August–September, pp. 26-30.
- Park, C.W., McCarthy, M.S. and Milberg, S.J. (1993), “The effects of direct and associative brand extension strategies on consumer responses to brand extensions”, Advances in Consumer Research, 20, pp. 28-33.
- Park, C.W., Jun, S.Y. and Shocker, A.D. (1996), “Composite brand alliances: an investigation of extension and feedback effects”, Journal of Marketing Research, 33(4), pp. 453-66
- Park, C.W., Milberg, S.J. and Lawson, R. (1991), “Evaluation of brand extensions: the role of product feature similarity and brand concept consistency”, Journal of Consumer Research, 18(2), pp. 185-93.
- Sheinin, D.A. and Schmitt, B.H (1994), “Extending brands with new product concepts: the role of category attribute congruity, brand affect, and brand breadth”, Journal of Business Research, 31, pp. 1-10.
- Nedungadi, P and Hutchinson, J (1985), “The prototypically of brand: relationshipwith brand awareness, preference and usage”, Advances in Consumer Research, 12, pp. 498-503.
- Kim, 2003. (incomplete citation)
- Roedder-John et al.,1998.
- Romeo, J.B.(1991),“The effect of negative information on the evaluation of brand extensions and the family brand”, Advances in Consumer Research, 18, pp. 399-406.
- Chen, C.H. Chen, S.K. (2000). Brand dilution effect of extension failure - A Taiwan study. Journal of Product and Brand Management. 9 (4), p243-254. (incomplete citation)
- Ries and Trout, 1981; Loken and Roedder-John, 1993.
- Martinez, Eva and de Chernatony, Leslie (2004), The effect of brand extension strategies upon brand image, Journal of Consumer Marketing, Vol. 21 Iss: 1, p. 39-50.
- Roedder-John et al., 1998, p.19
- Keller, K.L. (2001). “Building customer-based brand equity”. Marketing Management, 10(2), 14-19.
- Aaker, D.A. (1991), Managing Brand Equity, Free Press, New York, NY. Aaker, D.A. (1996), Building Strong Brands, Free Press, New York, NY.
- Keller (1998; 2001).
- Greising, 1998. (incomplete citation)
- Chen and Chen, 2000; Loken and Roedder-John, 1993, Martinez and Pina, 2003. (incomplete citations)
- Sjodin, H and Torn, F. (2006), “When communication challenges brand associations: a framework for understanding consumer responses to brand image incongruity”Journal of Consumer Behaviour, 5(1), pp. 32-42.
Further reading 
- Humperson, J. M. and Quandt, R. E. (1980), Microeconomic Theory: A Mathematical Approach. New York: McGraw-Hill Book Company.
- James D. O. (2006), “Extension to alliance: Aaker and Keller’s model revisited”, Journal of Product & Brand Management, 15(1), pp. 4–13
- John, D.R., Loken, B. and Joiner, C. (1998), “The negative impact of extensions: can flagship products be diluted?”, Journal of Marketing, 62(3), pp. 19–32.
- Keller, K.L. and Aaker, D.A.(1992),“The effects of sequential introduction of brand extensions”, Journal of Marketing Research, 29, February, pp. 35–50.
- Keller, K.L. (1993), “Conceptualizing, measuring and managing customer-based brand equity.”, Journal of Marketing, 57, pp. 1–22.
- Krane, J.A. (2006), “Flutes and Suits: The Case against Veuve Cliquot Ponsardin and Its Claim to Brand Extension ", University of Toronto Faculty of Law Review, 64, pp. 129–164.
- McWilliam, G. (1993), “The effect of brand typology on brand extension fit: commercial and academic research findings”, European Advances in Consumer Research, l(1), pp. 485–91.
- Mao, H. and Krishnan, S. (2006). “Effects of Prototype and Exemplar Fit on Brand Extension Evaluations: A Two-Process Contingency Model.”, Journal of Consumer Research, 33 (1), 41-49.Morrin, M. (1999), “the impact of brand extensions on parent brand memory structures and retrieval processes”, Journal of Marketing Research, 36, November, pp. 517–25.
- Pickton, D. & Broderick, A. (2005). Integrated Marketing Communications. England: Pearson Education.
- Rao, A.R., Qu, L. and Ruekert, R.W. (1999), “Signalling unobservable product quality through a brand ally”, Journal of Marketing Research, 36(2), pp. 258–68.
- Reddy, S.K., Holak, S.L.and Bhat, S.(1994), “To extender not to extend? Success determinants of line extensions”, Journal of Marketing Research, 31, May, pp. 243–62.
- Reast, J. D. (2005) “Brand trust and brand extension acceptance: the relationship”, Journal of Product & Brand Management, 14(1), pp. 4–13
- Ries, A. and Trout, J.(1986),”Positioning: The Battle for Your Mind”, McGraw-Hill, NewYork, NY.
- Smith, D.C. and Andrews, J. (1995), “Rethinking the effect of perceived fit on customers’ evaluations of new products”, Journal of the Academy of Marketing Science, 23(1), pp. 4–14.
- Sullivan, M.W. (1992), “Brand extensions: when to use them”, Management Science, 38(6), pp. 793–806.
- Shimp, T.A. (2003). Advertising, promotion, and supplemental aspects of integrated marketing communications. Mason: South-Western.
- Sunde, L. and Brodie, R.J. (1993), “Consumer evaluations of brand extensions: further empirical results”, International Journal of Research in Marketing, 10, pp. 47–53.
- Wenerfelt, B. (1988), “Umbrella branding as a signal of new product quality: an example of signaling by posting a bond”, Rand Journal of Economics, 19, Autumn, pp. 458–66.
- Zhang, S. and Sood, S. (2002), “"Deep" and "surface" cues: Brand extension evaluations by children and adults”, Journal of Consumer Research, 29(1), pp. 129–41.
See also 
- Spin-off (media), the process of deriving new radio programs, television programs or video games or even novels from already existing ones