How Brands Grow. Byron Sharp (2010)

What it argues

Three claims, in order of how much trouble each causes.

Growth comes from penetration. Brands get bigger by being bought occasionally by many more people, not by being bought more often by the people already buying. When a brand grows, penetration moves first and loyalty follows slightly. Not the other way round.

Double Jeopardy. Smaller brands are punished twice, with fewer buyers and slightly lower loyalty from them. This is a regularity across categories and decades, which means your loyalty metrics are largely a function of your size.

Distinctiveness beats differentiation. Buyers do not perceive much meaningful difference between brands and do not look for it. What they do is recognise. So the job is to be noticeable and easy to retrieve, not to be meaningfully distinct on an attribute.

Taken together these dismantle a great deal of received practice: loyalty programmes, narrow targeting, and most positioning work as commonly done.

What it gets right

The evidence base is the real contribution. This is a book built on observed purchasing rather than on stated preference, across many categories and many years, and the patterns it reports replicate. That is rarer in marketing than it should be.

It is also genuinely useful at the level of decisions. Reach broadly, be consistent, build distinctive assets, make the brand easy to buy. Those are instructions a team can act on tomorrow, and most of them are cheaper than what they replace.

And it is a corrective to an industry that had drifted into treating marketing as a branch of psychology practised on small samples.

What it is wrong about, or at least overstated on

Two things, and the book’s defenders tend to concede the first and resist the second.

Scope. The evidence base is weighted toward frequently purchased consumer categories. The extension to considered B2B purchases, where a buying group spends months comparing a handful of suppliers, is argued more than it is demonstrated. Some of it clearly transfers, mental availability in particular. Whether “buyers do not perceive difference” survives contact with a procurement committee is a fair question that the book does not really take on.

Tone. The book is written as though every opposing position is simply ignorance of the data. That makes it persuasive and it makes it harder to hold alongside anything else. The useful version of Sharp sits next to Ries and Trout rather than replacing them.

Who should read it, and who should not

Read it if you are responsible for a brand budget and have never seen the penetration data. It will change what you fund.

Read it if you are about to approve a loyalty programme.

Do not start here if you are a founder in a young category with a handful of customers. The laws describe established categories with many buyers, and applying them to a company with twelve clients produces confident nonsense.

The soundbite

Growth comes from being easy to think of and easy to buy, not from being loved by a few.

If you run the company rather than the marketing

This is the one book on the list I would actually ask a chief executive to read, and only the first half of it.

The reason is that it kills a specific expensive idea: that the route to growth is deepening the relationship with your best customers. That idea is intuitive, it feels prudent, and it justifies a lot of spending on people who were going to buy anyway. The data says growth comes from the opposite direction.

If you take one decision from it, make it this. Before approving anything aimed at existing customers, ask what the same money would do if aimed at people who have never bought from you. That question is not always answered in Sharp’s favour, particularly in B2B with few large accounts, but it is almost never asked at all.

The caution I would attach: this is a book about large categories with many buyers. If your business has thirty clients and two of them are a third of revenue, the laws in it do not describe your situation and applying them literally will cost you.