ETFs: why boring beats clever

This lesson is the general mechanics of funds and index investing. It deliberately does not cover Shariah screening of funds, which is a separate problem with its own failure modes and gets its own lesson in the Shariah-compliant vehicles lesson. Read that one too if you are screening.

An index fund or ETF is a basket of many companies combined into one purchase. You make one transaction, and you immediately own a small slice of every company on a defined list. A common example is the ASX 200 (a list of the top 200 companies in Australia). Owning a piece of the entire Australian corporate landscape is that simple. There is no selection process, no personal view, and no manager deciding what looks good this year.

One share of an ASX 200 ETF might cost around $100 today. Buy that single share, and your money is instantly split across all 200 companies. The American version is the S&P 500, which buys you a slice of the top 500 companies in the United States.

The alternative is a managed fund: a professional actively picks stocks for you, tries to choose the best holdings on your behalf, and charges a fee for the work.

There is a third option too: picking individual stocks yourself, with no professional and no fund. It is the most hands-on, complex and risky of the three.

Here is why that matters. Professional fund managers have far more time, information and experience than someone investing alone, and most of them still lose to the ETF. According to S&P's SPIVA Australia scorecard, 89% of actively managed Australian share funds underperformed the S&P/ASX 200 over the 15 years to June 2026. Even in the first half of 2026 alone, nearly 78% fell behind. You might've assumed a highly paid professional would beat a simple fund tracking the top 200 companies. The data says otherwise. If the professionals mostly lose, betting that you will do better is a hard case to make.

Why the professionals lose

The reasons are simple:

• The fee disadvantage. Managed funds usually charge close to 0.8% on average, some well above that. A broad index ETF can charge as little as 0.04%, and rarely more than 0.20%, a fraction of the cost.
• Skill is hard to spot in advance. Even if you luckily pick one of the minority of managers who beat the index over one stretch, it is unlikely they will still be ahead over the next. Winners rarely stay winners. Past performance is the only evidence you can choose with, and it is a poor guide to what comes next.
• The losers do not stay in the sample. Fewer than half of the Australian equity funds operating at the start of 2011 still exist. Funds that trail get closed or merged, and their track records disappear with them. The funds you can buy today are the survivors, which flatters active management before you even start comparing.

What the fee actually costs

$12,000 a year at a 10% return before fees, contributed at the start of each year, over 30 and 40 years, with different fees coming off it:

Two things a shorter version of this table cannot show. First, the damage accelerates. Ten more years more than triples what a 1% fee costs you, because the fee is taken from a balance that is itself compounding. Second, across a full working life a 1% fee takes more than a fifth of everything, and a full percentage point more than that (1.10% against 0.10%) takes about a quarter, which is the fee cost the cost of financial illiteracy warned about.

These are approximate, and the point is the scale rather than the decimal. Half a percent is not half a percent. Across a working life, it is a house deposit.

The automatic upgrade system

ETFs have a built-in cleaning mechanism. When a company does poorly, its value drops. Eventually it falls out of the top 200 or 500 and is automatically removed from the fund. When a new company grows massively, it climbs the list by value and is automatically added. Nobody has to pick the right stocks, because the fund is always holding the winners.

Take the 2000s. Blockbuster and BlackBerry were among the biggest companies in the world, and both were viewed as incredibly safe investments. In Australia, Dick Smith was just as trusted, a household name on high streets across the country, until it collapsed into administration in 2016. Blockbuster no longer exists. BlackBerry survives as a fraction of what it once was. Put your retirement into any one of these "safe" stocks, and you would have lost most or all of it.

An ETF investor never had to make that call. Blockbuster was automatically sold once it dropped out of the top companies. Amazon was automatically bought when it joined the S&P 500 in November 2005, years before it became a household name. That is not luck. It is design. Nobody can tell you in advance which companies will do well, which industries will boom, or which new technology is coming. An ETF removes the risk of betting your future on a single guess.

The question nobody can answer: when do you sell a winner?

Suppose you pick individual stocks and one of them doubles. Now what?

Sell, and you crystallise the gain, trigger CGT (the tax on that profit), and give up every future dollar the business earns. If it doubles again you watched it happen from outside. Hold, and you carry a position that is now a large share of your portfolio, and every further gain increases your concentration risk in a single company.

There is no rule that resolves this. Any rule you can state, sell at 50%, sell half, sell at a target price, is arbitrary. You will feel wrong either way, because after the fact one of the two paths will always have been better.

The index approach dissolves the question rather than answering it. The list rebalances mechanically. A company that grows becomes a larger weight because it got larger. A company that shrinks out of the index is removed. You are never asked to make the call, which matters more than it sounds, because that call is where a lot of self-inflicted damage happens.

The mechanism has an honest cost, and it is worth knowing. An index buys a company after it has grown, not before. Tesla joined the S&P 500 on 21 December 2020, after its shares had risen more than 700% that year, and every S&P 500 fund bought it at that price.^[1] Index investors never catch the early run of a future giant. They also never miss the giant entirely, and they never ride a loser all the way to zero. That is a trade, and it is a good one.

What an ETF or index fund actually buys you

• You cannot be wrong about which company wins. You own them all, so the question stops existing.
• You cannot be wrong about which manager wins: There is no manager to be wrong about (and no excessive fees!).
• It's passive: This matters more than it sounds, because doing things is how most people damage their returns.

One honest caveat

An index fund will fall when the market falls, by roughly the same amount. It offers no protection against bad years and does not claim to. What it removes is the risk of being wiped out by a single company collapsing or a single manager making a terrible call, which is a different and far more important job.

The catch worth stating plainly: a broad index fund is not screened for Shariah compliance. A standard ASX 200 fund holds the major banks, and they are several of its largest holdings. That problem, and what to actually check on a fund that claims to be screened, is the job of the Shariah-compliant vehicles lesson.