← All research Research · Markets and money · No. 29

The Future of Investing

How index funds, near-zero fees, robo-advisors, private-market access and AI agents are moving investment decisions from human judgment to machine code, and what that means for markets and for you.

In a single generation, investing has moved from a craft practised by humans to a utility run by machines: cheaper, faster, and open to almost anyone. Investing is being rebuilt from the decision up, and understanding the shift (cheaper, faster, more automated, more accessible) is the difference between riding it and being priced by it.

Chapters
9
Reading time
27 min
Updated
55%+US fund assets passiveindex funds hold the majority (Morningstar, year-end 2025)
0.32%Average fund feedown from ~1% two decades ago (Morningstar, 2026 Fee Study, for 2025)
~$23.9TGlobal ETF assetsfrom near zero in 1993 (ETFGI, end-Sep 2026)
~60-70%US volume algorithmicmachines, not people, set the tape

What this argues

  1. Passive won the argumentThe index quietly became the default owner of the market.
  2. Fees fell to near zeroOwning the market is now essentially free, so the money moved elsewhere.
  3. Advice got automatedRobo-advisors turned allocation into a utility, and incumbents absorbed them.
  4. Access is the new frontierPrivate markets and direct indexing are being opened to the many.
  5. Machines now decideFrom execution to allocation to agentic AI, with new, systemic risks.
00

What has changed

Updated November 2026

$23.9TGlobal ETF assets, end Sep 2026ETFGI; record was $24.03T at end Aug 2026
$2.24TRecord ETF net inflows, Jan-Sep 2026ETFGI, Oct 2026
0.32%Average US fund fee in 2025Morningstar, 2026 US Fund Fee Study (May 2026)
~25%Active strategies that survived and beat passive over 10 yearsMorningstar Active/Passive Barometer, Aug 2026
September 2026

Global ETF assets passed $24 trillion

  • ETFGI reported global ETF assets above US$24 trillion for the first time at end-August 2026 ($24.03 trillion), and about $23.9 trillion at end-September, up 20.7% year to date.
  • Year-to-date net inflows reached a record $2.24 trillion through September, with $276 billion in September alone (ETFGI, Oct 2026).
  • iShares, Vanguard and State Street SPDR together managed $13.93 trillion, 58.3% of the total, so scale concentration continues (ETFGI, Oct 2026).
May 2026

Fees fell again, passive fastest

Morningstar's 2026 US Fund Fee Study (May 2026) put the asset-weighted average fund fee at 0.32% for 2025, extending a two-decade decline. Passive funds averaged 0.10% after a 5.4% drop; active fund fees fell 2.7%.

August 2026

Active funds improved, but most still trail

Morningstar's Active/Passive Barometer for the year to June 2026 (published 12 August 2026, covering about $29 trillion, 67% of the US fund market) found just over 40% of active strategies survived and beat passive peers over one year, up 7 points. Over ten years only about 25% did.

Year-end 2025

Passive share of US fund assets reached about 55%

Morningstar data cited by PWL Capital (April 2026) show passive funds held over 55% of US fund assets at year-end 2025, up from about 53%, with roughly $951 billion of passive inflows against $187 billion of active outflows. Morningstar dates the passive-over-active crossover to end-2023, earlier than the 2024 framing in Chapter 02.

February-June 2026

Retail private-credit funds met gates

  • Blue Owl closed quarterly redemptions in its non-traded BDC OBDC II from February 2026 and returned about 30% of its NAV through a March capital distribution (Wealth Management, 2026).
  • Blackstone's BCRED lifted its Q1 2026 redemption limit from 5% to 7.9% to meet requests; Cliffwater's $33 billion interval fund received requests for 14% of shares against a 7% cap (Wealth Management, 2026).
  • Reports put total Q1 2026 private-credit redemption requests above $20 billion; this figure comes from secondary sources and is not independently verified.

This is the illiquidity-versus-liquid-promise tension described in Chapter 05 showing up in practice.

March 2026

The 401(k) alternative-assets rule moved to a proposal

Following the August 2025 executive order, the Department of Labor published a proposed rule on 30 March 2026 (Fiduciary Duties in Selecting Designated Investment Alternatives) creating a safe harbor weighing performance, fees, liquidity, valuation, benchmarks and complexity. Comments closed 1 June 2026; finalisation was reported as targeted for late 2026 (law-firm summaries, 2026). A final rule was not confirmed.

May 2026

A major broker moved toward AI-agent trading for retail

Robinhood announced plans to let customers direct AI agents to trade equities, derivatives, crypto and event contracts (FOW, 28 May 2026). Rollout details were not available to verify, so this Level-4/5 step for retail remains an announcement.

Not refreshed: robo-advised assets and the Vanguard, Schwab, Betterment and Wealthfront figures, direct-indexing projection, private-market asset totals, algorithmic share of volume, retail trading share, SPIVA 15-year figure, Big Three ownership share, Alpha Arena results and the quant-fund figures.

Test yourself

Some retail private-credit funds had to cap withdrawals in 2026. What does this show?

Morningstar found about 25% of active strategies survived and beat passive over ten years. How does this fit the passive story?

01

From Judgment to Code

The handoff from humans to machines

For four centuries the edge in markets belonged to human judgment. In four decades, it moved into software. Systems now sense, decide and execute faster than any person and, increasingly, they learn.

The long arc

Four centuries, from Amsterdam to autonomous agents

  1. First shares: Dutch East India Company shares trade in Amsterdam.
  2. Portfolio theory: Markowitz turns risk and return into mathematics.
  3. The index fund: Bogle launches Vanguard's first index fund.
  4. The ETF: SPY makes the S&P 500 trade like a stock.
  5. Robo-advisors: Betterment and Wealthfront automate advice.
  6. Agentic AI: LLM agents plan, trade and self-correct.
The autonomy ladder

Five levels, from manual to fully agentic

  1. L1 Manual: humans pick and place trades. (Human decides)
  2. L2 Algorithmic: pre-set rules execute.
  3. L3 Automated: optimised end-to-end.
  4. L4 Autonomous: models adapt to new data.
  5. L5 Agentic: systems set their own goals. (Machine decides)
The three equations

The math that made automation inevitable

BreakthroughWhat it did
Portfolio Selection (1952)Markowitz shows how to optimise return for a given risk: diversification becomes a formula.
CAPM and the Sharpe ratio (1964)Sharpe prices risk itself, giving every portfolio a benchmark and a score.
Black-Scholes (1973)Options get a formula, the first corner of finance to run fully on machines.
Retail rejoins the market

Individuals are back, but they trade through algorithms

Retail share of US trading %
View the data
Retail share
201011
201513
201915
202020
202124
202318
202420

Source: Bloomberg Intelligence; JPMorgan (2024) · values read from the chart, approximate

Test yourself

On the autonomy ladder, which level is where a system sets its own goals?

An investor picks stocks in a phone app, and the app's software decides how and when to execute. Which statement fits the chapter?

02

The Passive Revolution

How the index ate active management

The most successful investment strategy of the last fifty years was to stop trying to win. By simply owning the whole market at rock-bottom cost, index funds beat most professionals and took their assets.

The crossover

Passive assets overtook active by 2024 (Morningstar dates its own crossover to end-2023)

US fund assets: passive vs active $T
View the data
PassiveActive
20101.45.6
20132.77.2
20164.48.7
20196.79.8
20218.511.5
202312.813.2
202415.814.4

Source: Morningstar (2024) · values read from the chart, approximate

~90%Share of active US large-cap funds that trail the index over 15 yearsSPIVA's verdict is brutal and consistent across decades and geographies: after fees, the large majority of professional stock-pickers underperform a simple index. The exceptions are real but rare, and very hard to identify in advance.
The ETF supernova

A 1993 experiment is now a $24-trillion industry

Global ETF assets $T
View the data
Global ETF assets
20101.3
20142.6
20184.8
202110
202414.7
Sep 202623.9
2030E30

Source: ETFGI (2024, Oct 2026); BlackRock projections · values read from the chart, approximate

The passive flywheel

Why scale makes the leader almost unassailable

  1. Lower fees
  2. More inflows
  3. Greater scale
  4. Lower unit costs
  5. Cheaper still (and the loop repeats around index economics)
Active vs passive

Two philosophies, one clear scoreboard

The active promiseThe passive reality
GoalBeat the marketBe the market
Cost0.5-1.0% a year0.03-0.10% a year
BetSkill picks winnersCosts compound, not calls
RecordMost trail the indexBeats most active, net

Test yourself

About 90% of active US large-cap funds trailed the index over 15 years. What is the best reading?

In the passive flywheel, what comes right after lower fees?

03

The Race to Zero

How the price of investing collapsed

The cost of owning the market fell from about one percent to almost nothing: a price war investors won by doing nothing. When a product is commoditised, price falls to marginal cost. For indexing, that is close to zero.

The long slide

Average fund fees fell by more than half

Average fund fee (asset-weighted expense ratio) %
View the data
Avg fund fee
20000.93
20050.79
20100.68
20150.55
20200.41
20230.36
20250.32

Source: Morningstar US Fund Fee Study (2024, 2026) · values read from the chart, approximate

The economics of free

How cheap investing actually got

$0Stock commissionsUS brokers, since Oct 2019
0.00%Fidelity ZERO fundsindex funds with no fee, since 2018
0.03%Cheapest index fundsabout $3 a year per $10,000
~$0Cost to own the marketthe headline price of indexing
The road to zero

Four moves that took fees to nothing

  1. Index the market: Vanguard's mutual structure removes the stock-picker's salary.
  2. Wrap it in an ETF: trading efficiency and tax advantages cut costs further.
  3. Zero-fee funds: Fidelity launches index funds charging nothing.
  4. Zero commissions: Schwab, then all major brokers, drop trading fees.
If you're not paying, you're the product

Where 'free' investing actually earns its keep

  • Payment for order flow: brokers sell your orders to market makers for a fee.
  • Securities lending: your shares are lent to short-sellers; the fund keeps much of the fee.
  • Cash sweep: idle cash earns the broker interest, not you.
  • Cross-sell: free trading is the funnel for margin loans, advice and premium tiers.

Test yourself

A broker offers free stock trades. Which of these is one way it still earns money, according to the chapter?

The cheapest index funds charge 0.03% a year. How much is that on $10,000 invested for a year?

04

The Robo Frontier

Automated advice and hyper-personal portfolios

Robo-advisors proved a machine could do an adviser's core job (allocate, rebalance, and harvest losses) for a tenth of the price. Then the incumbents copied them, and the startups' edge became a feature everyone offers.

From niche to normal

Robo-advised assets marched toward $2 trillion

Robo-advised assets $T
View the data
Robo-advised assets
20191
20211.4
20231.8
2025E2.1
2028E2.3

Source: Statista; compilation (2025)

Inside the robot

What a robo-advisor actually does

  1. Profile: a questionnaire infers goals, horizon and risk tolerance.
  2. Allocate: map the profile to a low-cost ETF portfolio.
  3. Rebalance: drift back to target automatically as prices move.
  4. Tax-loss harvest: sell losers to bank tax savings, then reinvest.
Startups vs incumbents

Who actually won the robo war

The disruptorsThe incumbents
PlayersBetterment: ~$50B, still independent. Wealthfront: ~$75B, brand-led.Vanguard: ~$300B+ advised, digital + human. Schwab: ~$80B intelligent portfolios.
EdgeDesign, UX, being firstExisting clients, trust, scale
Problem / ResultProblem: costly to acquire clientsResult: absorbed the innovation
The wealth-tech map

Where each model sits on automation and personalisation

A two-axis map of automation (horizontal) against personalisation (vertical). Bespoke, hand-made (top left): private banking and human advisor. Bespoke, automated (top right): direct indexing. Middle right: robo-advisor. Lower right: target-date fund and, in the generic, automated corner, the index ETF. Generic, manual (bottom left) is empty.

$800BProjected direct-indexing assets by 2026, up from ~$260BDirect indexing owns an index's individual stocks directly, unlocking security-level tax-loss harvesting and custom tilts (drop tobacco, overweight climate). Cerulli projects it to outgrow ETFs, which is why BlackRock (Aperio), Morgan Stanley (Parametric), Vanguard and Fidelity all bought their way in.

Test yourself

Which task is NOT one of the four steps a robo-advisor performs?

Who ended up running the largest robo books?

05

Access: Private Markets

Opening the returns once reserved for the few

The best returns migrated to private markets, and the industry is now racing to sell them to everyone else. Fewer companies go public; value is created before the IPO. Access, not allocation, is the new battleground.

Where the money went private

Private-market assets roughly tripled in a decade

Private-market assets $T
View the data
Private-market assets
20102.5
20155
20209.5
202314
2028E20

Source: Preqin; McKinsey Global Private Markets Review (2024)

The access pyramid, inverting

Who can buy private markets, and how that is changing

Investor tierAccess route
Sovereign and pensionsDirect deals, lowest fees, first look
Endowments and institutionsFull private allocations, 20-40% of assets
Ultra-high-net-worthFeeder funds via private banks
Accredited investorsInterval funds and BDCs
Mass-market / 401(k)Semi-liquid funds, tokenised access
The ways in

Six wrappers opening private markets to the many

  • Interval funds: own private assets; redeem a fixed slice each quarter.
  • BDCs: listed vehicles that hold portfolios of private credit.
  • Semi-liquid funds: Blackstone's BREIT and peers, built for the wealthy.
  • 401(k) inclusion: private equity enters US retirement menus.
  • Tokenisation: blockchain fractions of funds and assets.
  • Evergreen funds: perpetual vehicles with no fixed end date.
Democratisation: promise vs peril

Opening private markets cuts both ways

The promiseThe peril
Access / IlliquidityReturns once reserved for the eliteYou can't always get out
Diversification / FeesAssets that don't move with stocks2-and-20 versus 0.03% indexing
Growth / ValuationCapture value before the IPOMarks are opaque and lagged
Fairness / SelectionThe small investor gets a seatRetail gets what institutions pass on

Test yourself

Why do semi-liquid and interval funds carry a built-in risk for retail buyers?

Private-market assets in the chart go from $5T in 2015 to $14T in 2023. By what multiple did they grow?

06

The Autonomous Engine

From automating trades to generating alpha

The next ambition is not to match the market cheaply, but to beat it with machines that learn. Quant funds proved code can win; now LLMs and agents are reaching for the same prize, in public.

The quant vanguard

The firms that let code, not committees, invest

FirmWhat sets it apart
Renaissance / MedallionThe greatest track record in finance, reportedly ~39% net a year.
Two Sigma$60B+ built on scanning text, filings and data at scale.
CitadelRanked #1 all-time by net gains: deep quant plus execution.
D.E. ShawStatistical arbitrage since 1988; the Oculus fund rarely loses.
XTX MarketsMachine-learning market-making across 50,000+ instruments.
Jump TradingDeep and reinforcement learning for microsecond decisions.
~39%Reported net annual return of Renaissance's Medallion fund since the late 1980sThe best-documented long-run record in markets, roughly double Berkshire Hathaway's ~20% a year, was produced by scientists treating prices as data. Medallion closed to outside money in 1993: its edge shrinks with size, the clearest sign that machine alpha is scarce, not scalable.
The autonomous stack

Six layers of a fully machine-run portfolio

  1. Risk and compliance: monitor, stress-test and enforce constraints.
  2. Execution: algorithms slice and route orders (e.g. JPMorgan's LOXM).
  3. Portfolio construction: optimise positions within risk limits.
  4. Signals: models translate information into predicted edge.
  5. Research: finance-native LLMs read filings, news and transcripts.
  6. Data: real-time and historical, market and non-market signals.
Two futures for machine capital

Centralised platforms vs distributed agents

CentralisedDistributed
ModelBlackRock's Aladdin monitors risk on ~$20T+ of assetsOpen-source agents, agentic wallets, on-chain identity
ShapeOne hub connected to many nodesA mesh of independent, interconnected agents
The fully autonomous portfolio

What a Level-5 mandate looks like end to end

  1. Set objectives: the human gives goals and constraints, not trades.
  2. Sense and research: agents ingest markets and news continuously.
  3. Decide and size: models choose positions and a risk budget.
  4. Execute and adapt: trade, monitor outcomes, adapt without reprogramming.

Test yourself

Medallion closed to outside money in 1993. What does the chapter say this suggests?

Where does competitive advantage sit in the autonomous stack?

07

The New Fragilities

The hidden costs of a machine market

When everyone owns the same index and runs the same model, everyone tries to sell at the same moment. Automation removes human error and adds systemic correlation. Cheaper markets can be more fragile ones.

The risk register

Six fragilities a serious investor tracks

  • Herding: common models crowd the same trades, then unwind together.
  • Model homogeneity: if everyone buys the same data, signals converge and diversification fails.
  • Flash events: automated selling can drain liquidity in minutes.
  • Concentration: three firms vote most of the S&P 500's shares.
  • Accountability: you can't jail an algorithm; who owns the harm?
  • Regulatory mismatch: over- and under-regulation across jurisdictions.
When the machines misfired

Four times automation broke the market

What happenedThe lesson
Quant Quake, 2007Crowded quant trades unwound at onceShared models, shared risk
Flash Crash, 2010~$1T lost in minutesAutomation drains liquidity fast
Knight Capital, 2012$440M lost in 45 minutesNo kill-switch, no company
Volmageddon, 2018Volatility products implodedFeedback loops feed themselves
~20%+Share of the average S&P 500 company owned by the 'Big Three' index managersBlackRock, Vanguard and State Street together hold a fifth or more of most large US companies, an unprecedented concentration of voting power created, ironically, by the most passive of strategies. Common ownership is now an antitrust and governance question, not a fringe one.
How to govern a machine market

East and West are diverging

United StatesChina
ApproachTechnology-neutralApprove algorithms first
TimingJudged after the factReviewed before deployment
FocusRisk controls, disclosure, fraudState visibility, stability
Trade-offFaster, but higher riskSafer, but slower
The fragility dashboard

Four dials to watch as machines take the wheel

DialWhat it asks
Algo share (Volume)Is the human ever the marginal trader?
Big Three (Concentration)How much of the market do three firms vote?
Private in 401(k) (Access)Does illiquidity reach retail retirement?
Agentic incidents (Autonomy)The first true Level-5 blow-up

Test yourself

Why can many different automated systems still cause a market crash?

The US and China differ in how they govern algorithms. Which is correct?

08

Reference

Glossary and sources

Reference

Plain-language glossary

TermMeaning
Index fundA fund that owns a whole market rather than picking stocks.
Passive investingMatching a market instead of trying to beat it.
Robo-advisorSoftware that builds and manages a portfolio for you.
Private marketsInvestments not traded on public exchanges.
ETFAn index fund that trades all day like a share.
Expense ratioThe annual fee a fund charges, as a % of assets.
Direct indexingOwning an index's individual stocks for tax and tilt control.
Agentic AISystems that plan, act and self-correct with little human input.

The genius of the machine age of investing is that it made owning the whole market almost free. Its danger is that when everyone owns the same thing, run by the same code, a market can forget how to disagree, and a market that cannot disagree is one trade away from a stampede.

Key takeaways

The five conclusions to take away

  1. Cheaper won: passive and near-zero fees are permanent, not cyclical.
  2. Advice became software: robo and direct indexing commoditised allocation.
  3. Access is the next fight: private markets are being opened, carefully or recklessly.
  4. Alpha stays scarce: beta democratised; machine alpha did not.
  5. Correlation is the new risk: efficiency in the calm, fragility in the crisis.
Reference

Sources and further reading

  • Morningstar: US Fund Fee Study; active vs passive flows (2023-24).
  • Investment Company Institute (ICI): Fact Book, index fund and ETF data.
  • ETFGI: global ETF industry assets (2024).
  • S&P Dow Jones Indices: SPIVA Scorecard (active vs index).
  • Preqin; McKinsey: Global Private Markets Review (2024).
  • BlackRock: Aladdin, iShares and ETF market projections.
  • SEC, CFTC, FINRA, BIS: market-structure and algorithmic-trading oversight.
  • Company disclosures; Statista; Nof1.ai Alpha Arena. Figures marked 'est.' are compilations.

Test yourself

What is an expense ratio?

Which pairing of conclusion and reason is right?

Sources cited

Morningstar · ETFGI · Bloomberg Intelligence · JPMorgan · BlackRock · Vanguard · Statista · Preqin · McKinsey · S&P Dow Jones Indices (SPIVA) · Investment Company Institute · SEC · CFTC · FINRA · BIS · Institutional Investor · Treleaven et al. · Coinbase · Ethereum (ERC-8004) · Nof1.ai Alpha Arena · Journal of Finance · Nobel Committee · Reuters · Company disclosures · ETFGI, Oct 2026 · Morningstar, 2026 US Fund Fee Study · Morningstar Active/Passive Barometer, Aug 2026 · PWL Capital, Apr 2026 · US Department of Labor proposed rule, Mar 2026 · Wealth Management, 2026 · FOW, May 2026 · InvestmentNews, Aug 2026

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Research, not investment advice. Figures as of , from the sources cited.

Legal information and disclosures

These are my own views as of the update shown on this page. They can change without notice, and I have no duty to update them. Past performance does not indicate future results, and any investment can lose money.

This is for education only. It is not investment, legal, tax, medical or accounting advice, and it is not an offer to sell or a solicitation to buy any security in any jurisdiction. It does not consider your goals or circumstances.

Figures from company filings, public agencies and other third parties are believed to be reliable, but I have not independently verified them and cannot guarantee them. Forecasts and anything marked as an estimate rest on assumptions that may prove wrong.

Please do not copy or republish this material without my written consent.