Take the colour off a bottle of your favourite fizzy drink and you could probably still name it. The red can, the curved glass, a jingle, even a sound: small cues that your memory attaches to one name. A company that spent billions on that connection owns something that does not appear on any factory floor, and it can be worth more than the factory.
Brand management is the discipline of building, protecting and valuing that connection. It has two schools that disagree sharply about how brands grow. A graduate knows both arguments, because both are used in real meetings.
- Who takes it
- Marketing majors in year 3, as an elective or core course (Wharton's marketing concentration lists brand among its electives, after the consumer and research courses). MBAs take it as "Strategic Brand Management".
- What it is for
- Deciding what a name should mean in people's minds, how to protect it, and what it is worth.
- Comes after
- Consumer Behavior (34/58), which in turn needs Marketing Management (34/57).
- Leads to
- No later subject lists it as a prerequisite, but it feeds Pricing (34/61), Digital Marketing & Advertising (34/62) and Product Innovation & Go-to-Market (34/63).
- What this piece gives you
- You will not be able to run a brand audit. You will know what a brand is, how its value is estimated, what each school recommends, and why two well-known rebrands failed. Easier first reads in the library: Social Media Marketing (The Default Course) and The Biases That Fool Everyone (17/02). This one goes further.
What a brand is: associations in memory
The older, legal definition, one the American Marketing Association has used, is a name, term, sign, symbol or design that identifies one seller's goods and sets them apart from others. That is a trademark. The modern idea, from Kevin Lane Keller's 1993 paper "Conceptualizing, Measuring, and Managing Customer-Based Brand Equity" in the Journal of Marketing, goes further: a brand lives in the buyer's head. It is the set of associations linked to a name, such as "reliable", "for kids", "expensive", "where Grandma shops". Brand knowledge, Keller argued, is awareness plus those associations, and what makes a brand valuable is when the associations are strong, favourable and unique.
That reframes the job. A company does not make a brand; it supplies cues (name, colour, pack, price, behaviour) and customers form the memory. The memory can be reinforced or damaged by anything the buyer sees, including things the company didn't intend.
Brand equity: what the name adds, and how it is valued
David Aaker, in Managing Brand Equity (1991), listed five sources of value attached to a name: brand loyalty, name awareness, perceived quality, associations, and other proprietary assets such as patents and trademarks. Brand equity is the extra value a product gets from carrying the name, compared with the same product unnamed. It shows up as higher prices, higher volume, or lower marketing cost for the same sales.
Valuing it is hard, and there are several methods. The consultancy Interbrand's method, in outline, does three things: estimate the profit the business makes beyond what its capital requires, work out what share of the buying decision is down to the brand (the "role of the brand"), and then discount those earnings at a rate that is lower for stronger brands. Interbrand's Best Global Brands 2026 list (interbrand.com, checked 1 November 2026) puts Apple first at $514.6 billion, Microsoft second at $443.7 billion and Google third at $389.3 billion. Other firms use different methods and publish different values, so treat any single number as an estimate from one method. Try the logic yourself.
Illustrative inputs. Fixed in this toy: tax 25%, capital charge 5% of revenue, long-run growth g = 2%, discount rate r = 12% − 6% × strength/100. If economic profit is negative the value shown is zero. Real methods use forecasts, more factors and judgement; Interbrand, Kantar BrandZ and Brand Finance can give very different values for the same brand.
Try the two levers a brand manager controls. Raise the role of the brand and the value rises in proportion. Raise brand strength and the discount rate falls, which lifts the value more than you'd expect. A strong brand is valuable partly because its earnings are seen as safer.
Positioning and the classic school: loyalty and difference
The school of thought taught for decades, associated with Aaker and Keller, says: choose a clear position, make the brand different from rivals in ways customers value, and build loyalty so that customers buy again and pay more. Keller's "brand resonance" model (Strategic Brand Management) climbs from salience (do they know you?) through meaning and judgements to resonance (do they feel attached?). On this view, targeting the right segment and being distinct is how brands win.
It leads to practice you will recognise: brand personalities, "purpose", loyalty programmes, premium positioning. It is intuitive. The next school asks whether the data agree.
The evidence-based school: be easy to think of and easy to buy
Byron Sharp and colleagues at the Ehrenberg-Bass Institute for Marketing Science (University of South Australia) argue, in How Brands Grow (Oxford University Press, 2010), from decades of purchase data. Their claims: brands grow mostly by adding customers (penetration), including many who buy the category rarely, not by raising the loyalty of a few; brands in a category differ far less than marketers believe; and what matters is mental availability (coming to mind in buying situations, helped by many linked cues) and physical availability (being easy to find and buy).
Their key empirical pattern is double jeopardy, noticed by William McPhee in 1963 and developed by Andrew Ehrenberg and colleagues (for example "Double Jeopardy Revisited", Journal of Marketing, 1990): small brands have fewer buyers and those buyers are slightly less loyal. If loyalty were the engine, big brands wouldn't also have more of it by default. The surprise is that you get the pattern with no loyalty built in at all. Test it: every household picks a brand at random in proportion to its share.
Invented market with five brands (shares 40, 25, 15, 12, 8%). 3,000 simulated households each buy the category the chosen number of times; every purchase picks a brand at random with probability equal to its share. No brand has loyal customers by design. Real purchases vary across households, which is why researchers use richer models.
The small brand has far fewer buyers, and those buyers buy it less often per year, purely by arithmetic. Marketers who see that and say "small brands have a loyalty problem" are, on this view, misreading chance. What does the data say the small brand should do? Reach more people.
The classic school replies. It says the evidence comes mostly from repeat-purchase packaged goods, where choices are low-involvement; that luxury, B2B, subscriptions and services may work differently; and that Sharp's sweeping rejection of segmentation and differentiation goes beyond the data. The Ehrenberg-Bass team says the patterns are found in many categories, including some services. Another widely used piece of evidence, Les Binet and Peter Field's The Long and the Short of It (2013, built on the UK IPA Effectiveness Awards database), suggests emotional brand-building drives long-term growth and activation drives short-term sales, with a rule of thumb of about 60% on brand and 40% on activation. The field has not settled the argument. A prudent reading: be easy to find and easy to remember, and be wary of any claim of loyalty without data.
Distinctive assets: how a brand gets recognised
If brands grow by being noticed and remembered, the cues matter: a colour, a shape, a character, a sound, a slogan. Jenni Romaniuk of the Ehrenberg-Bass Institute, in Building Distinctive Brand Assets (Oxford University Press, 2018), proposed testing each cue on two numbers: fame (what share of the category's buyers link the cue to the brand) and uniqueness (of those, what share link it only to that brand). A cue needs both. A famous but shared cue, such as red for a soft drink, helps every rival too.
Invented examples. The 50% dividing lines are chosen for this illustration; practitioners set their own benchmarks by category. The grid idea is from Romaniuk; the quadrant names here are mine.
Brand extensions: borrowing a name for something new
A brand extension uses an established name on a new product, to save the cost of building awareness. Aaker and Keller's 1990 study ("Consumer Evaluations of Brand Extensions", Journal of Marketing) found that people accepted extensions more when the parent brand was seen as high quality and the new product fit it, in three ways: it complements the parent, it can substitute for it, and the maker seems able to transfer its skills to make it. The original lab study found little sign that a bad extension damaged the parent; later research suggests dilution can happen under some conditions, so a stretch is not free of risk.
Invented examples and a toy score: (quality ÷ 5) × (sum of the three fits ÷ 15). It shows the idea that quality and fit both matter, not Aaker and Keller's fitted model.
Rebrands that went wrong: Tropicana 2009 and Gap 2010
In January 2009, Tropicana's Pure Premium orange juice launched new packaging designed by the Arnell Group: the old picture of an orange with a straw in it gave way to a glass of juice and a new look. Reports from Ad Age, based on retail data, said sales of the line fell about 20% between 1 January and 22 February (about $33 million), and on 23 February 2009 the company said it would restore the old design. Several rivals gained over the same weeks. The Ehrenberg-Bass reading is that Tropicana threw away its most recognisable cue. The sales data show the fall; they cannot, on their own, separate the redesign from other causes, but the reversal speaks for itself.
In October 2010, Gap unveiled a new logo, a bold black "Gap" in Helvetica with a small blue square, replacing its familiar white-on-navy box. After a wave of online criticism it announced a return to the old logo within about a week (sources differ on the exact days; most say the change was reversed on 11 or 12 October). Gap had also floated a crowdsourcing idea, which it dropped. No reliable figure for the cost has been published, so ignore the numbers that circulate online.
Two lessons. First, a visual identity is a stock of memories; changing it can burn the stock. Second, rebrands often fail quietly. We remember these because the reversals were public. Not every change fails, and many go unnoticed.
What a graduate just sees
- A brand is memory: associations linked to a name, not the logo.
- Brand equity is the extra value the name adds; valuing it is an estimate from a method, never a fact.
- Small brands have fewer buyers and slightly lower loyalty even in a random market: don't mistake arithmetic for a loyalty problem.
- Growth usually means reaching more people, including light buyers, not only deepening a few.
- A cue works only if it is both famous and unique to the brand.
- Extensions work when the parent is trusted and the new product fits.
- Changing an identity spends memory; do it only with evidence.
- The field is split: ask which school a claim comes from and what its data cover.
Where it shows up next
- Pricing (34/61): a brand's premium is its price power, and discounting can erode it.
- Digital Marketing & Advertising (34/62): search and social reach (physical and mental availability online) and the long-versus-short debate.
- Product Innovation & Go-to-Market (34/63): new brand or extension? Both launches and names depend on this.
- In the world: a founder choosing a name, a company renaming after a merger, a nonprofit asking why donors recognise it.
If you want to go deeper
- 📘 Textbook. Kevin Lane Keller and Vanitha Swaminathan, Strategic Brand Management (Pearson, 5th edition). The standard course text for the classic school.
- 📘 Textbook. David Aaker, Building Strong Brands (1996) and Managing Brand Equity (1991). The sources of the equity framework.
- 📘 Gentler (the evidence-based school). Byron Sharp, How Brands Grow (Oxford University Press, 2010). Readable; read it alongside a classic-school book to see both sides.
- 📘 Also. Les Binet and Peter Field, The Long and the Short of It (IPA, 2013). Jenni Romaniuk, Building Distinctive Brand Assets (Oxford University Press, 2018).
- 🌐 Free course. MIT OpenCourseWare 15.810 Marketing Management (it includes brand sessions; I did not find a free full course on brand management).
A brand is a pattern of memories attached to a name, and it is worth money because it makes purchases easier and prices stickier. Be easy to find and easy to remember, keep the cues that people already link to you, extend only where the fit is real, and treat any brand-valuation number or growth theory as one school's view.
Try this: cover a brand's name on a pack or ad and ask yourself what tells you who it is. Count the cues. Which are unique to it, and which could belong to any rival?
Sources. Keller, Journal of Marketing 57 (1993). Aaker, Managing Brand Equity (Free Press, 1991). Aaker & Keller, Journal of Marketing 54 (1990). Sharp, How Brands Grow (OUP, 2010). Ehrenberg, Goodhardt & Barwise, "Double Jeopardy Revisited", Journal of Marketing 54 (1990); McPhee (1963). Romaniuk (OUP, 2018). Binet & Field (IPA, 2013). Interbrand, Best Global Brands 2026 (interbrand.com, accessed 1 November 2026; the method outline is from Interbrand's description, simplified here). Tropicana: Ad Age data via Bloomberg (2 April 2009) and trade reports, 20% sales fall 1 January to 22 February 2009, reversal announced 23 February 2009. Gap: reports in The Daily Beast, Fashion Network and others from October 2010; the dates vary by one day or two between sources. The valuation, double-jeopardy and extension tools use invented data; calculations were checked in node. This is not business or investment advice.
- 🌐 MIT OCW 15.810 Marketing Management
- 🌐 Interbrand, Best Global Brands
- 📘 Keller & Swaminathan, Strategic Brand Management
- 📘 Sharp, How Brands Grow