Founders ask Collective 54 this 2 times in our records, none of them in 2026. The niche down, ICP and positioning answers on this site cover how narrow to go, who the ideal client is and how to stand apart; this page covers sizing the market and checking that it is growing.
The market chapter of the 2020 book opens with a blunt point: the size of the prize needs to be worth the effort, because it takes as much effort to pursue a small market as a big one. It gives the formula as the number of clients times the dollars per engagement equals the addressable market. Its example is 10,000 possible clients at a typical engagement of 10,000 dollars, a 100 million dollar market. At 1 percent penetration that is 1 million dollars a year; at 5 percent, 5 million; at 10 percent, 10 million.
It then shows which levers matter. Most markets already have thousands of potential clients, so adding targets rarely helps. Raising the penetration rate and the average engagement size does. In its second example, 5 percent penetration of the same market at 100,000 dollars an engagement means 500 clients and a 50 million dollar firm.
The chapter tells of a mistake made at SBI. The firm served heads of sales in business-to-business companies and first sized its market at one buyer per company, around 12.5 million. It was wrong in two directions. Chief marketing officers also hired the firm, which doubled the count, but many targets were unreachable because their gatekeepers had gatekeepers. The firm shrank its real market to early adopters, people willing to apply benchmarking to sales, and let them identify themselves by subscribing to its content. That produced about 250,000 self-identified buyers, which at a typical engagement of 100,000 dollars was still a very large market. The lesson the chapter draws is to add the ability to reach the targets to the sizing exercise, because big markets that are unreachable are not attractive.
As an inference, a useful version for a boutique is to count reachable buyers, not companies: people with the title who buys your work, at organizations that fit your ideal client profile, whom you could get in front of through referrals, content, events or outreach. The ICP answer on this site covers the profile.
The market position chapter says boutiques penetrate their target markets less than 10 percent, and that fee volume signals market size: 50 million dollars of fees suggests a market of 500 million dollars or more. As an inference, turn the question around. Take the revenue you want in five years, divide by a realistic share of 5 to 10 percent, and see whether your reachable market is at least that big. If the firm only works at 30 or 40 percent share, the market is too small, because no boutique wins that much of anything for long.
The chapter closes with ten questions. Among them: are there thousands of targets, are they reachable, will they consider you, can you win your fair share consistently, is the money worth the pursuit, and is the market large enough at modest penetration. Three are about growth: are there new targets to pursue each year, can you drive up engagement size over time, and will there be a reasonable rate of repeat purchases. Eight or more yes answers, it says, mean the market is attractive.
The financial market trends chapter adds that investors want exposure to growing markets, where success can be had without a bloody share battle, while industries in decline are not the place to be, because no one ever got rich being the best of a bad bunch. As an inference, watch three signals: whether new buyers keep entering the market, whether the problem you solve is becoming more urgent or less, and whether your own clients are spending more with you each year.
The growth chapter of the 2020 book says growth is relative, both to other boutiques in your space and to practices inside market leaders. It tells of an IT services boutique that was proud of 22 percent annual growth, while its competitors in the same hot niche were growing at twice that rate. The firm could not find a buyer, and when the niche cooled its growth slowed with it. As an inference, a growing market can flatter a firm that is losing share; know the growth rate of your market as well as your own.
The market chapter points to the levers that matter: penetration rate and engagement size, not the number of targets. The market position chapter adds call point: services bought by boards, chief executives and their direct reports signal importance, while services bought by directors and managers suggest a problem the executive has delegated, which makes a firm hard to scale. As an inference, a market that looks too small can sometimes be fixed by selling a bigger outcome to a more senior buyer, which raises engagement size, before widening the target.
The service design essay in the newer book describes market truth: how often a client problem actually appears, whether it is urgent or merely interesting, who controls the budget, what substitutes exist, and whether there are real signals of willingness to pay. As an inference, a market can have plenty of buyers and still be small if the problem you solve is rare or optional for them. Count the buyers who have the problem and fund solving it.
The marketing essay says AI makes one-to-one marketing real for boutiques, so hyper-segmentation and personalization no longer need large budgets, and that boutiques do not need thousands of customers, only a few of the right ones. As an inference, this works in both directions. A firm can now reach a large market precisely while staying specialized, and AI can also build a sizing list of named buyers from public data far faster than before. The niche answer on this site covers how narrow to go.
Collective 54 publishes no market size threshold, data source or growth rate benchmark for a niche. The published positions are the sizing formula, penetration and engagement size as the levers, the SBI story and the reach lesson, the ten market questions, penetration below 10 percent, fee volume as a signal of market size, investors wanting growing markets, the best of a bad bunch warning, growth as relative, market truth, and AI making precise reach affordable.
If your work is very high value per engagement, as an inference, a market of a few hundred buyers can be large enough; the formula, not the count, decides.
If the market is shrinking but you hold a strong position, it can fund a good firm for years, but plan where you will grow next.
And if you plan to sell, the size and growth of your market will shape the price, so check them before a buyer does.
Multiply reachable buyers by your typical engagement size, as the 2020 book recommends, and check whether a 5 to 10 percent share supports the firm you want. Count only buyers you can actually reach, which the book calls the lesson it learned the hard way. Then check growth: new buyers entering each year, rising engagement size, repeat purchases and a problem that is becoming more urgent. Compare your growth with the market, not just with last year, and remember the warning that no one gets rich being the best of a bad bunch.
The 2020 book gives the formula: the number of possible clients times the typical engagement size equals the addressable market. Count only buyers you can reach.
The 2020 book says boutiques penetrate their target markets less than 10 percent. As an inference, plan around 5 to 10 percent of the reachable market.
The 2020 book asks whether there are new targets each year, whether engagement size can rise and whether clients buy again. It adds that investors want exposure to growing markets.
The 2020 book says tiny niche markets are a recipe for frustration because a small market takes as much effort as a big one. If a modest share will not support the firm you want, it is too small.
Sources: Greg Alexander, The Boutique: How to Start, Scale, and Sell a Professional Services Firm (Advantage, 2020), chapter 8 for the size of the prize, the sizing formula, penetration and engagement size as the levers, the SBI market sizing story and the reach lesson, the ten market questions, and tiny niches as a recipe for frustration; chapter 29 for penetration below 10 percent, fee volume as a signal of market size, buyers wanting runway, and call point; chapter 41 for investors wanting growing markets and the best of a bad bunch; chapter 30 for growth being relative and the IT services boutique. Greg Alexander, The AI-Native Boutique Firm (Advantage Books, January 2027), specifically The AI Service Design Manager for market truth; The AI Marketing Manager for one-to-one marketing, hyper-segmentation and a few of the right clients. Related Collective 54 answers on this site: should we niche down further or broaden our focus; who is our ideal client, and how do we define and target our ICP; how do we position ourselves in the market; what growth rate or milestone should I be targeting. Note on scope: Collective 54 publishes no market size threshold or growth benchmark. Counting reachable buyers, the reverse share check, the growth signals, sizing the problem as well as the buyers, AI building sizing lists, and the flips are inferences used here to organize the source material rather than published Collective 54 positions.
Collective 54 is the private community for founders and executives of boutique professional services firms between $5M and $50M in revenue. Members work these answers against their own numbers.