Is it bad that three firms dominate?

It has produced the cheapest funds in history and raises genuine governance concentration questions (Chapter 86). Both are true, and the tension is unresolved rather than hypocritical.

Why doesn't a small provider just undercut the giants?

Because below a few basis points nobody covers costs without scale or other revenue. Price is not where a small provider can win; niche and specialty are.

Should I avoid small providers?

No, but weight closure risk and range commitment in your selection (Chapters 59, 67). Several excellent funds come from smaller houses; the risk is peripheral products, not small firms per se.

Do zero-fee funds cost me something invisible?

They monetise through lending, cash and relationships, all disclosed. Check the lending disclosure (Chapter 36) and the realised tracking difference (Chapter 35), which is where any cost would appear.

Will fees keep falling?

On core products, they are near the floor of viability. The more likely developments are in the adjacent businesses: model portfolios, direct indexing (Chapter 96) and bundled advice: rather than in the fee line itself.

The Business of ETFs — ETF Bible (Chapter 88)

The revenue equation and what it forces

Revenue = AUM × fee. Costs are largely fixed: index licensing (Chapter 39), custody, audit, listing, compliance, market-maker support, technology and staff. A fund needs roughly $50–100m in assets before it covers those costs (Chapter 67's closure threshold, seen from the provider's side).

Work through the implications:

A $500m fund at 0.05% earns $250,000 a year: barely covering the cost of running it, before any contribution to the firm.
A $500m fund at 0.65% earns $3.25m, which is a viable business line.
A $100bn fund at 0.03% earns $30m, which is only sustainable because the same infrastructure serves dozens of such funds.

So the strategy of a firm with $3tn and the strategy of a firm with $3bn cannot be the same, and the products they launch differ accordingly. When you see a small provider launch a narrow thematic fund at 0.55%, you are watching a rational response to this arithmetic, not necessarily a conviction about the theme.

Two viable businesses, one industry. Scale products need billions and earn points; specialist products need hundreds of millions and earn percentages — and both games fund something investors use.

The concentration, and why it is stable

Three firms, iShares/BlackRock, Vanguard and State Street, hold roughly 59% of global ETF assets (ETFGI, mid-2026), and the top ten hold the overwhelming majority. The concentration is stable for structural reasons:

Scale begets scale. Larger funds spread fixed costs thinner, enabling lower fees, which attract more assets. The flywheel is genuine and hard to enter.

Liquidity begets liquidity. Bigger funds attract more market makers, giving tighter spreads, which institutions prefer, which brings more assets (Chapter 71's correlation, operating as a business moat even though it is not a liquidity fact).

Distribution matters more than product. Platform placement, model-portfolio inclusion, adviser relationships and index licensing terms determine flows more than fund quality does. A better fund without distribution gathers nothing.

First-mover advantage is extraordinarily durable. The first fund in a category typically retains dominance even when cheaper competitors arrive, because switching means realising capital gains (Chapters 52–53) and because institutional liquidity concentrates in the incumbent. This is why some of the largest funds in the world are not the cheapest in their category, and why they stay largest anyway.

How providers actually make money beyond fees

The headline fee understates the revenue picture, and each additional stream has appeared elsewhere in this book:

Securities lending (Chapter 36): the manager's share of lending revenue is a genuine profit centre, and provider practices differ substantially in the split.
Cash management: interest on fund cash and collateral, which matters more at positive rates.
Self-indexing (Chapter 39): building indices in-house avoids licence fees paid to third parties, converting an expense into margin.
Vertical integration: a provider whose parent also runs a brokerage, a model-portfolio business or an index arm captures value at multiple points.
Loss-leader economics: ultra-cheap core funds exist to acquire relationships that are monetised elsewhere in the firm.

The investor-relevant reading: a 0.03% fee does not mean the provider earns 0.03% from you. That is neither sinister nor free: it is a business model, and it explains how zero-fee funds can exist at all.

The fee war and where it stopped

The path from 0.20% to 0.03% on core US index products was driven by competition for scale and by the flywheel above. Two observations about where it landed:

It stopped at the floor of viability, not at zero. Below a few basis points, funds cannot cover licensing and operations without other revenue, so the handful of zero-fee products are acquisition tools monetised through lending, cash, or the firm's broader relationship with the customer.

It never reached the margin game. Thematic and active fees have barely moved. Competition drove down the price of the commodity and left the specialty products alone, because buyers of those products are not shopping on price: they are shopping on story (Chapter 47).

That asymmetry is the single most useful thing an investor can know about industry pricing: the products you should own got radically cheaper, and the products you should be sceptical of did not.

Reading the industry's output

Practical translations of the economics above:

A wave of launches in a category signals demand and fee opportunity — information about what investors currently want, not a verdict on merit either way. Launches usually lag performance (Chapter 47's launch clock), so the calendar tells you where the crowd already went.
A fee cut on a core fund is competition working in your favour, and worth checking against your holdings.
A provider "committing" to a product range matters for closure risk (Chapter 67): flagship ranges survive; peripheral experiments are rationalised.
Free or near-free funds deserve one question, not suspicion: how is this monetised? Usually lending, cash, or relationship acquisition, all disclosed.
Consolidation is likely to continue, because the scale game's arithmetic does not soften.

Both lines fell; the gap persists. Asset-weighted fees, 2000–2024: what investors actually paid, not headline rates.

What this means for the investor

Three actionable conclusions:

1. Benefit from the scale game unapologetically. The concentration that raises legitimate governance questions (Chapter 86) has also delivered the cheapest investment products in history. You are the beneficiary of a brutal competitive war, and the correct response is to hold the products it produced.

2. Read new launches through the value lens. The margin game at its best sells genuine services: a covered-call ETF charges 0.35–0.60% and replaces an overlay that would cost a retail investor far more in commissions, spreads and errors to run alone; a buffer fund packages an options structure most people could not assemble at all. The same aisle also sells fee opportunities dressed as products. The sorting question is fair to both: “what work is this fee paying for, and could I do that work more cheaply myself?” When the answer is real work you cannot replicate, a fee can be a bargain — and the industry earning margins by widening investors’ choices is the system working.

3. Fee is not the whole cost, and cheap is not free. Chapter 56's total cost of ownership still governs, and Chapter 36's lending disclosures tell you where a cheap fund's economics come from.

A worked example

A mid-size European provider with €12bn in assets plans its year.

Option A: launch a broad MSCI World UCITS ETF at 0.12%. Competing against multi-billion incumbents with better liquidity and platform placement. Realistic first-year gathering: €150m. Revenue: €180,000. Cost of launch and support: comparable. Verdict: strategically defensible only as a range-completion product.
Option B: launch a thematic fund in a category with recent strong performance, at 0.55%. Realistic first-year gathering, given the flows chasing that theme: €400m. Revenue: €2.2m. Verdict: the business case is not close.

The firm launches Option B. Every incentive in its structure pointed there, and nobody in the process had to be cynical for that outcome to occur.

Three years later the theme has cooled, assets have fallen to €90m, and the fund appears on a closure list (Chapter 67), where a portion of investors realise losses at the worst point of the cycle. Also unsurprising, and also nobody's stated intention.

The Business of ETFs