One of the most common pieces of passive investing discussion centres around:

“Just buying low-cost global index funds.”

It sounds simple. And to be fair, it is probably one of the most sensible starting points for long-term investors.

However, when you actually start looking for one, you quickly realise there is not just one version of a global index fund. There are several.

Some include only developed markets.
Some include developed and emerging markets.
Some include large companies only.
Some include large, medium and small companies.
Some are mutual funds.
Some are ETFs.
Some are cheap.
Some are slightly more expensive.
Some are available on one platform but not another.

So the phrase “just go buy a global index fund” is useful, but it needs a bit more explanation.

The basic idea is simple.

Instead of trying to pick the next Apple, Nvidia, Microsoft or Amazon, a global index fund lets you own a tiny slice of hundreds, or even thousands, of companies around the world.

You're not trying to predict the next winning company, country or fund manager—you simply want broad exposure to global capitalism at the lowest possible cost, held over a long period.

That's the beauty of passive investing. It may sound boring, but boring is often incredibly effective.

One example is the Vanguard FTSE Developed World UCITS ETF, ticker VHVG.

This is the fund I personally like and use.

It gives exposure to developed markets such as the US, UK, Europe, Japan, Canada and Australia. It is low cost, simple and easy to understand.

The important point, though, is that it does not include emerging markets.

So if you buy something like VHVG, you are not really buying the entire world. You are buying the developed world.

For me, that is not a problem. I like the simplicity. I like the low cost. I like the fact it gives huge exposure to the world’s biggest and most established stock markets.

But someone else may prefer a fund that includes emerging markets too. Neither approach is automatically right or wrong. You just need to know what you own.

The next step up is an “all-world” fund.

These usually include developed markets and emerging markets.

Examples include:

HSBC FTSE All-World Index Fund C Acc
Vanguard FTSE All-World UCITS ETF
Invesco FTSE All-World UCITS ETF
iShares MSCI ACWI UCITS ETF

These funds are closer to what many people probably mean when they say “global index fund”.

They typically include large and medium-sized companies from both developed and emerging markets.

So rather than just owning the US, Europe, Japan and other developed markets, you may also get exposure to countries such as India, China, Taiwan and Brazil.

That can be attractive because emerging markets may offer long-term growth potential.

But they can also be more volatile, more politically complicated and sometimes harder to stomach in prolonged financial downturn.

Then you have the fuller version.

A good example is the Vanguard FTSE Global All Cap Index Fund.

This includes developed markets, emerging markets, large companies, medium-sized companies and smaller companies.

In simple terms, this is probably one of the closest options to buying “the whole global stock market” in a single fund.

That is why it is so popular; it is a proper one-fund solution.

You could buy it, keep adding to it, and avoid spending the next 20 years pretending you know which region, sector or company will outperform.

There is a lot to be said for that.

The downside is that it is usually a little more expensive than some simpler developed-world or all-world funds. But these cost are still quite negligible when selected as DIY passive investing option.

This is where people often get stuck. But I think the decision can be simplified.

If someone wants maximum simplicity and broad global exposure, a global all-cap fund such as Vanguard FTSE Global All Cap is hard to argue with.

If someone wants developed and emerging markets but does not care too much about smaller companies, an all-world fund such as HSBC FTSE All-World, Vanguard FTSE All-World or iShares MSCI ACWI could make sense.

If someone wants low-cost developed market exposure, something like Vanguard FTSE Developed World UCITS ETF — VHVG could be a very clean option.

That last one is my personal favourite.

Not because it is perfect.

No fund is.

But because it is simple, cheap, diversified and easy to stick with. That does not mean you should invest in that fund just because I do. Research each different type of fund, compare historical data, and see which option best suits your investing goals.

I’ve compared a few different funds below as a representative example. This is by no means exhaustive, there are literally hundreds of global funds out there to choose from.

The interesting point is that all five funds have produced remarkably similar returns. The differences over five years have been surprisingly small considering they track different indices.

The main reason VHVG has edged ahead is simple: it excludes emerging markets. Over the last five years, developed markets—particularly the US and its large technology companies—have significantly outperformed emerging markets. Had emerging markets enjoyed a stronger period, VHVG might have lagged instead.

For most investors, the choice isn't really about chasing performance. It's about deciding what exposure you actually want.

People obsess over tiny differences between funds. (Most perform quite similarly)

Should I pick this one or that one?
Should I include emerging markets?
Should I include small caps?
Should I use a fund or an ETF?
Should I pay 0.12% or 0.23%?

These are fair questions but they are not the main battle.

The main battle is behaviour.

Can you keep investing?
Can you avoid panic selling?
Can you ignore the noise?
Can you stop fiddling?
Can you let compounding actually do its job?

That is where the real money can be made.

A sensible global index fund isn't exciting. What it can do is quietly get the job done. Sometimes, that's exactly what a portfolio needs—not drama or genius, but a low-cost, globally diversified fund that you understand, combined with the discipline to leave it alone.

The Compounder
Long-term investing made simple.

The Compounder is for financial education and commentary only. I am not authorised or regulated by the Financial Conduct Authority and I do not provide financial advice, investment advice, or personal recommendations. Nothing published here should be taken as a recommendation to buy, sell, hold or switch any investment, fund, pension, ISA, crypto asset or financial product. Always do your own research and consider speaking to an FCA-authorised financial adviser if you are unsure.