In 1997, Steve Jobs returned to Apple and cut 70% of the product line. The company was producing printers, servers, PDAs, monitors, and over a dozen variations of the Macintosh. Revenue was declining. The organization was confused. Resources were spread so thin that no single product received the attention it needed.

Jobs drew a two-by-two grid on a whiteboard: consumer and professional across the top, desktop and portable down the side. Four products. That was the plan. Everything else was eliminated.

Within three years, Apple returned to profitability. Within a decade, it became the most valuable company in the world. The lesson was not about product design or marketing. It was about focus — the deliberate decision to do fewer things and do them at a level that competitors cannot match.

Diversification is driven by three impulses, all of which feel rational in the moment.

The first is revenue anxiety. When growth in the core business slows, the instinct is to find new revenue streams. A marketing agency adds web development. A consulting firm adds training. A software company adds professional services. Each addition generates incremental revenue and creates the appearance of growth.

The second is customer demand. An existing client asks for a service the business doesn't provide. The business says yes — because saying yes to a client feels like good service, and the revenue is easy. Over time, the business accumulates capabilities not because of strategic intent but because of client requests.

The third is competitive reaction. A competitor adds a new product line. The business feels pressure to match — not because the new line is strategically sound, but because not matching feels like falling behind.

Each impulse leads to the same result: a wider business that is shallower in every dimension. More services, less depth. More products, less focus. More markets, less expertise.

The cost of diversification is not financial — at least, not immediately. It is attentional. Every new product, service, or market requires management attention: hiring, training, quality assurance, marketing, sales, and support. That attention is finite. When it is divided across more activities, each activity receives less of it.

A consulting firm that offers strategy, marketing, operations, technology, and HR consulting must maintain expertise in five domains. The firm that offers only strategy consulting concentrates all of its talent acquisition, training, intellectual property development, and brand building in one domain. The generalist firm is competent across five areas. The specialist firm is exceptional in one. Clients who need exceptional work — and are willing to pay for it — choose the specialist.

This dynamic is consistent across industries. The specialist law firm commands higher rates than the general practice. The specialist surgeon commands higher fees than the general practitioner. The specialist manufacturer wins contracts that the diversified manufacturer loses. Depth commands a premium. Width does not.

Focus creates competitive advantage through three mechanisms.

Expertise accumulation. A company that does one thing for a decade accumulates knowledge, processes, and capabilities that a diversified competitor cannot match. The focused company encounters every edge case, solves every variation of the problem, and develops institutional expertise that becomes its moat.

Brand clarity. A company known for one thing is easier to remember, easier to refer, and easier to trust than a company known for many things. When a CEO needs help with pricing strategy, they remember the firm that specializes in pricing — not the firm that listed pricing as one of twelve capabilities on its website.

Resource efficiency. A focused company spends its entire budget on one domain. The diversified company spreads the same budget across multiple domains. The focused company invests more in R&D per domain, more in talent per function, and more in marketing per segment. The result is not just better output — it is disproportionately better output, because concentration of resources produces nonlinear returns.

If you cannot describe what your business does in one sentence — a specific, concrete sentence, not a vague statement about "helping businesses grow" — your business may lack focus. The sentence forces specificity: who do you serve, what do you do for them, and why are you the best at it?

"We help mid-market SaaS companies reduce customer churn" is focused. "We provide consulting services to technology companies" is not. The first statement attracts a specific buyer with a specific need. The second statement attracts no one in particular — which, in practice, means it attracts whoever is cheapest.

Focus is not a limitation. It is a strategy — the strategy of being so good at one thing that the market comes to you rather than you chasing the market. The businesses that resist this principle — that continue adding capabilities, entering new markets, and saying yes to every opportunity — will survive. The businesses that embrace it will thrive.

There is a difference, and it compounds.