Düsseldorf. For many retail investors, the quest for the perfect portfolio often begins and ends with a single, foundational decision: which "world index" should serve as the bedrock of their long-term investment strategy? Whether it is the MSCI World, the MSCI All Country World Index (ACWI), or the FTSE All-World, the financial industry is locked in a perpetual marketing cycle, offering an ever-expanding array of products that promise distinct advantages, geographic diversification, or sector-specific tilt.
However, a recent analysis of year-to-date performance data yields a surprising, if not sobering, conclusion: for the average investor, the specific choice between these three primary benchmarks has been largely irrelevant in 2024. Despite the complex marketing narratives surrounding each, the performance variance between the top-performing ETFs tracking these indices has remained within a remarkably narrow margin of 0.2 percentage points.
The Myth of Differentiation
To understand this convergence, one must look at the "best-in-class" performers for each category. According to data from the investor portal ExtraETF, the frontrunners this year include the UBS Core MSCI World UCITS ETF, the iShares MSCI ACWI UCITS ETF, and the Invesco FTSE All-World UCITS ETF.
Since the start of the year, these funds have tracked each other with near-robotic precision, all posting gains in the range of 15.9% to 16.1%. While the MSCI ACWI currently holds a marginal lead and the MSCI World sits slightly at the back of the pack, a visual overlay of their performance charts reveals a near-identical trajectory. For the retail investor, this raises a fundamental question: if the outcome is essentially the same, why does the industry continue to emphasize the "unique" composition of these funds?
The answer lies in the mechanics of market-capitalization weighting. All three indices operate on the principle that the largest companies command the largest share of the index. Consequently, despite the FTSE All-World boasting coverage of approximately 3,000 more companies and 26 additional countries compared to the MSCI World, the underlying exposure remains strikingly uniform.
The "Big Tech" Gravity Well
A closer examination of the holdings within these indices reveals that they share the same DNA. In all three cases, the United States dominates the geographic allocation. Furthermore, the information technology and communications sectors account for roughly 40% of the total index value, and the ten largest companies—mostly American mega-cap tech stocks—collectively represent about 25% of the total index weight.
This "head-heaviness" means that the indices are less a reflection of the "global economy" and more a reflection of the fortunes of a handful of Silicon Valley giants. When the S&P 500 tech sector rallies, all three indices rise in lockstep. The minimal performance gaps that do emerge are almost exclusively attributable to the exposure each index grants to Asian markets and emerging economies.
For instance, the MSCI World includes only three Asian markets—Japan, Hong Kong, and Singapore—which combine for a roughly 7% weighting. In contrast, the FTSE All-World and the MSCI ACWI allocate 18% and 16% respectively to Asia. In 2024, this has been a critical differentiator. The rally in semiconductor stocks in South Korea and Taiwan provided a tailwind for the FTSE and ACWI indices, while the more "Western-centric" MSCI World missed out on that specific surge.
Long-Term Trends and the "Value" Anomaly
While the divergence in 2024 favored indices with higher Asian exposure, the long-term historical record tells a different story. Since 2019, the MSCI World has frequently outperformed its broader counterparts. This is due to its higher concentration in US technology stocks, which have enjoyed a historic bull run over the past five years.
However, the industry has begun experimenting with alternative weighting strategies to break the cycle of market-cap dominance. New products, such as those launched by Amundi, utilize Gross Domestic Product (GDP) weighting to rebalance country exposure. Others, like the Invesco equal-weight variant of the MSCI World, aim to reduce the influence of US tech by giving every stock the same weight. While these strategies perform well during specific market rotations—such as the mid-year shift toward industrial and utility stocks—they often lag behind the standard MSCI World during periods of tech-led growth.
The Rise of Factor Investing
The most significant deviation from the "standard" performance in 2024 has not come from geographic shifts, but from "Factor Investing." Investors who moved beyond simple market-cap indices into specific style-based ETFs have seen drastically different results.
According to the latest data, three specific factor-based approaches have outperformed the standard world indices by a wide margin:
- Value Factors: The Xtrackers MSCI World Value ETF has surged by 36% year-to-date.
- Momentum Factors: The iShares MSCI World Momentum Factor ETF is up between 19% and 21%.
- Quality Dividends: The iShares MSCI World Quality Dividend Advanced ETF has seen similar gains of 19% to 21%.
The Danger of Concentration
While these returns look attractive, they come with a hidden trade-off: extreme concentration. By filtering the investment universe for "Value" or "Momentum," these funds slash their holdings from several thousand companies to a few hundred.
A prime example is the role of Micron Technology within the Value-weighted ETFs. Micron, which has seen its share price jump 200% this year, makes up a staggering 15% of the Xtrackers Value ETF. While this concentration drove massive outperformance, it essentially transformed a "diversified" ETF into a concentrated bet on a single chipmaker.
Similarly, the "Quality Dividend" and "Momentum" ETFs remain heavily dependent on the same tech giants (Apple, Nvidia, Microsoft, Alphabet) that dominate the standard indices. Therefore, these factor funds are not necessarily "safer" or "better diversified"; they are simply different types of bets.
Implications for the Retail Investor
For the average investor, the data suggests three key takeaways:
- The "Index War" is largely marketing: Whether you choose the MSCI World, ACWI, or FTSE All-World, you are essentially buying a proxy for the US technology sector. The choice of index provider is significantly less important than the decision to stay invested.
- Concentration is the real driver of alpha: The massive returns seen in factor-based ETFs are not the result of superior diversification, but rather the result of concentrating capital into a smaller pool of winners. This works brilliantly in a bull market but leaves investors significantly more exposed to individual stock volatility.
- Beware of "recency bias": While Momentum and Value strategies have outperformed this year, they are subject to cyclical shifts. If market sentiment turns, the "winners" of 2024 could just as easily become the biggest losers of 2025.
Conclusion
The financial industry excels at creating the appearance of choice. By offering dozens of variations on "World" ETFs, firms can capture different segments of the market, even if the underlying product is fundamentally identical. For the long-term investor, the lesson is clear: keep it simple. The difference between 15.9% and 16.1% is negligible compared to the impact of consistent, low-cost investing over several decades.
As the markets continue to evolve, the siren song of "better" indices will undoubtedly continue. However, the data confirms that for most portfolios, the path to wealth is not found in the perfect index, but in the discipline to ignore the noise and stay the course.
