Management consulting is neither a closed club of Ivy League MBAs serving only global giants nor a guaranteed money-back upgrade for your business. The truth sits in the middle: consulting is a $100-to-$280-billion industry whose value depends heavily on how you buy it.
If you’re weighing your first consulting engagement, hiring consultants for the tenth time, or thinking about becoming one, the myths below will cost you money or mislead your career plans. Each one is tested against court filings, government inquiries, peer-reviewed research, and the industry’s own disclosures.
Why do so many myths about consulting persist?
Short answer: the industry is huge, profitable, and unusually opaque, which lets caricatures fill the gaps where facts should be. Even analysts can’t agree on its basic size. Consultancy.org’s overview of the consulting market notes that reputable estimates range from just over $100 billion to nearly $280 billion, depending on how each analyst defines “consulting.”
That definitional fog matters to you. When a firm tells you it serves “the whole market,” or a critic tells you consulting is “a trillion-dollar scam,” both are working from a number nobody can fully verify. The chart below shows how far apart four respected measurement shops sit.
How big is the global consulting market? Four analysts, four answers
Estimated global consulting market size by analyst firm (US$ billions). Data as of July 2026, compiled by Consultancy.org.
| Analyst | Estimated market size (US$ bn) |
|---|---|
| FEACO | 280 |
| ALM Intelligence | 240 |
| Gartner | 131 |
| Source Global Research | 120 |
Keep that spread in mind as we go. An industry that can’t be measured cleanly is easy to mythologize — in both directions.
Myth 1: “All consultants are ex-MBA types from the same schools”
No — the stereotype had some truth twenty years ago, but hiring has broadened sharply, and it’s shifting again right now. You no longer need an MBA, or even a business degree, to walk into a top firm.
The elitist core of the myth isn’t baseless. McKinsey, the industry’s flagship, has historically recruited primarily from a short list of target schools, and its acceptance rates remain famously low. But the same firms were also early movers in hiring PhDs, doctors, lawyers, and domain specialists with no business training at all. The US Bureau of Labor Statistics profiles management analysts — the government’s umbrella category for consultants — as a workforce entering through bachelor’s degrees in everything from business to psychology to engineering, with a median wage of $101,190 as of May 2024.
The newest twist cuts against the myth even harder. In January 2026, Fortune reported that McKinsey is now actively re-prioritizing liberal arts majors, with CEO Bob Sternfels telling Harvard Business Review the firm is “looking more at liberal arts majors, whom we had deprioritized” as a source of creativity that AI models can’t supply. Candidates are also being tested on how well they work with the firm’s internal AI tool, Lilli — a screening criterion that didn’t exist three years ago.
If you’re picturing the job, this official explainer from McKinsey’s own channel is a fair starting point — note how much of the day-to-day work it describes is interviewing, data analysis, and working sessions rather than boardroom theatrics:
What you should take from this: if you don’t have an MBA, the door is more open than the myth says. And if you’re hiring, don’t assume the team in front of you all took the same path — ask. The mix of backgrounds on a project team is often a better quality signal than the brand on the pitch deck.
Myth 2: “Consulting is only for Fortune 500 companies”
Wrong on two counts: mid-sized companies are a major buyer group, and some of the biggest consulting clients on earth aren’t companies at all — they’re governments.
The Fortune 500 image comes from the origin story. Modern management consulting grew up advising large industrial corporations in the early twentieth century, and the prestige firms still lead with blue-chip client rosters. But the market’s middle is thick. The same industry estimates that value the global market at $120 to $280 billion are counting thousands of mid-market and boutique firms whose typical client is a $50-million manufacturer or a regional hospital group, not Coca-Cola. Solo practitioners and ten-person shops selling operations help to local businesses sit inside the BLS’s roughly one-million-strong management analyst workforce, and the agency projects about 98,100 openings a year through 2034 — volume that global giants alone couldn’t generate.
Public-sector demand is the other quiet giant. The Los Angeles Times’ 2025 account of McKinsey’s centennial describes a client list spanning companies “and governments that span the globe,” and the controversies you’ll read about later in this article — in South Africa’s tax authority and in the US opioid crisis — arose from government-adjacent and public-health work, not Fortune 500 strategy decks.
For you as a buyer, the practical point is this: there is almost certainly a consulting offer at your budget level, from an independent expert to a mid-tier firm. The myth mainly survives because big firms market the big-client image. Don’t let it stop you from asking for proposals — and don’t let it push you into hiring a firm built for giants when a specialist half the price will do.
Myth 3: “Consultants just recycle the same playbook”
Partly true, and the industry earned the accusation — but it describes the worst of the trade, not the whole of it, and it’s becoming an expensive assumption to hold.
The criticism has a long paper trail. Economists Mariana Mazzucato and Rosie Collington argue in their 2023 book The Big Con that consultancies oversell standardized advice while clients’ own capabilities atrophy — a “confidence trick,” in their words, sustained by the absence of transparent outcome data. Earlier critics made similar points about formulaic re-engineering waves: McKinsey’s own 1975 “overhead value analysis” method, for example, helped fuel a broad middle-management downsizing trend, a reminder that one firm’s template can ripple across thousands of companies whether or not it fits them.
Yet the “copy-paste” charge is testable, and the best test to date says management know-how genuinely transfers. In a landmark field experiment published as NBER Working Paper 16658 (later in the Quarterly Journal of Economics), Nicholas Bloom and colleagues gave randomly selected Indian textile plants months of free consulting on modern management practices and compared them with untouched control plants. The treated plants raised productivity by about 11% through better quality, efficiency, and inventory control — and, tellingly, most hadn’t adopted the practices before simply because they didn’t know them. Generic as “good management” sounds, it wasn’t common knowledge.
The recycling accusation is also colliding with a commercial shift. McKinsey’s UK managing partner told Business Insider in November 2025 that clients increasingly come with an outcome, not a scope, and that roughly a quarter of the firm’s global fees now ride on performance-based arrangements. You can’t bill against outcomes with a warmed-over template. And this post from the firm’s official account shows where its research muscle is pointed now — measuring why AI investment so often fails to become capability:
Your takeaway: some consultants absolutely do recycle — and you should screen for it. Ask a bidding firm which parts of its proposal are reusable method and which parts were built for you this month. A good firm will answer crisply; a template shop will get vague.
Myth 4: “Hiring a big-name firm always delivers ROI”
It doesn’t, and the public record includes failures so expensive they ended up in courtrooms, judicial inquiries, and settlement agreements. A famous brand reduces some risks and introduces others.
Start with the cleanest documented case. In August 2016, Hertz hired Accenture to rebuild its website and mobile apps, with a December 2017 go-live. The date slipped to January 2018, then April 2018, and the work never met spec; Hertz terminated the contract and in April 2019 sued in New York for the $32 million it had paid plus damages, alleging — as The Register reported from the filed complaint — that Accenture “never delivered a functional website or mobile app,” skipped the contractually required responsive design, and then demanded extra fees to fix it. Accenture called the suit “without merit.” Whatever the legal endgame, a $32 million write-off at a global top-tier firm is not an anecdote; it’s a counterexample to the myth.
South Africa offers a second, grimmer case. In 2015, Bain & Company led a restructuring of the South African Revenue Service (SARS) under commissioner Tom Moyane. A judicial review — the Nugent Commission, reporting in December 2018 — and testimony before the Zondo Commission into state capture later tied the reorganization to a collapse in SARS’s enforcement capacity. Whistleblower Athol Williams, a former Bain partner, documented roughly twenty meetings between Bain’s South Africa managing partner and then-president Jacob Zuma between 2012 and 2016. Bain repaid the fees it had earned at SARS, and the scandal ultimately contributed to the firm shutting down its South African operations. The client here didn’t just lose money; a national institution was damaged.
Then there is the industry’s largest reputational bill. In February 2021, McKinsey agreed to pay about $573 million to settle claims brought by US states over its advisory work for Purdue Pharma, the maker of OxyContin, with CNN putting the running total near $600 million. The firm acknowledged its work fell short of its standards while not admitting wrongdoing — treat that apology as the company’s own framing, and the settlement figure as the independently verified fact. Either way, “we advised on this” is not a defense any client wants to be funding.
Set against all this, the Bloom experiment from Myth 3 showed consulting producing an 11% productivity gain — under specific conditions: a defined operational problem, measurable baselines, and months of embedded implementation. The pattern across the failures is the inverse: vague mandates, no internal owner, and success defined as deliverables rather than outcomes. ROI from consulting isn’t a property of the firm you hire; it’s a property of the deal you structure.
For a sense of how the firms themselves now talk about staying useful under this pressure, this briefing from Boston Consulting Group’s official channel is instructive — the emphasis has shifted from advice-as-product to applied capability building:
Myth 5: “Anyone can start a consulting firm — it’s easy money”
Starting is easy; that’s the true part, and it’s exactly why succeeding is hard. Low barriers to entry mean you’re competing with everyone else who had the same idea, while the top of the market is simultaneously automating the junior work that used to train newcomers.
The demand side looks friendly on paper. The BLS projects 9% employment growth for management analysts from 2024 to 2034, much faster than average, with about 98,100 openings a year. But openings aren’t margins. When a field has no licensing requirement, no protected title, and a median wage above $100,000, supply floods in — and buyers respond by demanding proof: case studies, references, sector depth, and increasingly outcome-linked fees.
Meanwhile the established players are squeezing from above. The LA Times reports McKinsey’s revenue has hovered around $15–16 billion for five years, that it cut roughly 1,400 jobs in 2023 under the internal label “Project Magnolia,” and that leaders have discussed trimming about 10% of non-client-facing staff. The firm that symbolizes the industry’s golden ticket is on a diet. And per Fortune’s reporting, it now fields around 20,000 internal AI agents alongside roughly 40,000 humans — capacity that directly competes with the billable research and analysis hours small firms sell.
Clients have noticed the shifting economics, as this post from Polymarket’s account captures:
None of this says “don’t start.” It says the easy-money version is fantasy. The independent consultants who thrive pick a narrow problem they can prove they’ve solved before, price against results where possible, and treat the BLS growth figure as a statement about competition, not a promise.
How should you vet a consulting firm before signing?
Given everything above, the vetting question practically answers itself — you run the process the myths tell you to skip. A workable sequence:
- Define the problem in numbers before you shop. “Grow revenue” is a wish; “cut inventory days from 61 to 45” is a brief a serious firm can price and you can audit.
- Ask what they’re reusing. Every firm has methods; the question is whether they can name what’s bespoke in your proposal. Vague answers predict template delivery.
- Interview the team, not the partner. The people in the pitch are rarely the people in your building. Get the delivery team’s names and backgrounds in the contract.
- Tie a slice of fees to outcomes. McKinsey says about a quarter of its fees are now performance-linked; if the giants can do it, so can your bidder. Even 15–20% at risk changes behavior.
- Check references from engagements that went badly. Every firm has them — Hertz-Accenture and Bain-SARS prove the point at the top end. Ask how the firm behaved when things slipped.
- Plan your own capability. The sharpest criticism in The Big Con is that outsourcing hollows out the client. Budget for your staff to absorb the methods, or you’ll be re-hiring the firm forever.
What is the biggest mistake companies make when hiring consultants?
Hiring against a vague brief with no metrics and no internal owner:
- No defined problem or baseline
- No success metrics in the contract
- No internal owner for delivery
- Paying for activity, not outcomes
The one step to take before you sign anything
Before you commit to a six-figure engagement, carve out a paid pilot: four to eight weeks, one measurable problem, one named team, and a fee structure that rewards the result you’re actually buying. A firm that believes its own pitch will accept those terms — the Bloom experiment showed what consulting can do under exactly these conditions, and the Hertz and SARS cases showed what happens without them. Treat the pilot’s scorecard as your real reference check, then scale only if the numbers moved. That’s how you stop buying myths and start buying results.
References
- “Consulting Market” — Consultancy.org (accessed 22 July 2026)
- “Management consulting” — Wikipedia (accessed 22 July 2026)
- “McKinsey & Company” — Wikipedia (accessed 22 July 2026)
- “Management Analysts — Occupational Outlook Handbook” — US Bureau of Labor Statistics (updated August 2025; wage data May 2024)
- “McKinsey challenges graduates to master AI tools as it shifts hiring hunt toward liberal arts majors” — Fortune (14 January 2026)
- “McKinsey to hire Liberal Arts candidates” — Mint (January 2026)
- “Does Management Matter? Evidence from India” (Working Paper 16658) — Bloom, Eifert, Mahajan, McKenzie & Roberts, NBER (January 2011)
- “AI is reshaping how McKinsey makes money” — Business Insider (November 2025)
- “Why is McKinsey cutting thousands of jobs during its 100th anniversary year?” — Los Angeles Times (16 December 2025)
- “Accenture sued over website redesign so bad it Hertz” — The Register (23 April 2019)
- “Hertz hits Accenture with $32 million lawsuit over failed website redesign” — TechSpot (April 2019)
- “How Bain & Company helped capture South Africa’s Revenue Service” — PPLAAF (accessed 22 July 2026)
- “State capture-implicated Bain & Company shuts down SA operations” — The South African (accessed 22 July 2026)
- “McKinsey Settles for Nearly $600 Million Over Role in Opioid Crisis” — The New York Times (3 February 2021)
- “McKinsey to pay nearly $600 million in settlements over its work with opioid companies” — CNN Business (4 February 2021)
- “The Big Con (Mazzucato and Collington book)” — Wikipedia (book published 2023; accessed 22 July 2026)
- “What do consultants do anyway?” — McKinsey & Company, official YouTube channel
- “BCG Is Betting on Strategic Clarity and Applied AI” — Boston Consulting Group, official YouTube channel
- Post on AI investment and maturity gap — McKinsey & Company official X account (December 2025)
- Post on AI pushing consulting firms to rethink pricing — Polymarket official X account (24 May 2026)
Brian C Jensen is the CEO of Legacy Global Consulting, Inc., a management consulting firm. With 10+ years of experience, he advises organizations on digital transformation, risk management, and growth strategy—helping clients anticipate market shifts and scale sustainably.