Emerging Markets ETFs: How Much to Add to Your Portfolio and What Risks to Weigh

Your Global ETF Does Not Cover the Whole Planet

Anyone holding an ETF that tracks the MSCI World often feels like they own “the whole world.” In reality they own only part of it, a large part, but still only part: the countries classified as developed markets. The United States, Europe, Japan, Canada, Australia. China, India, Brazil, Taiwan and dozens of other countries are not in there.

The gap is not a minor technicality. Emerging markets today account for roughly 40 percent of world GDP measured at purchasing power parity, yet they weigh only around 10 to 12 percent in the MSCI ACWI, the index that combines developed and emerging markets into a single global basket. Anyone who stops at MSCI World simply does not see them at all.

The question for anyone building a genuinely global portfolio is whether this exclusion is a problem worth fixing or a reasonable choice worth keeping. The answer, as is often the case in investing, depends on how much extra risk you are willing to accept in exchange for a higher growth potential.

Why Economic Weight and Market Weight Do Not Match

The reason emerging markets carry so little weight in equity indices, despite representing such a huge share of the global economy, comes down to three main explanations.

Market capitalization is not GDP. An index like the MSCI ACWI weights countries by the market value of listed companies actually available to international investors, not by the size of the underlying economy. Many large Chinese companies, for instance, are not freely accessible to foreign investors, or only partially so, due to local regulatory limits.

Emerging markets are younger as financial markets. Exchanges like those in India or Brazil developed far later than Wall Street or the London Stock Exchange, and still have fewer listed companies and shallower capital markets than their economic potential would suggest.

The classification itself keeps shifting. MSCI, FTSE and the other major index providers periodically review which countries count as “emerging” and which as “developed,” based on liquidity, accessibility for foreign investors and regulatory stability. Taiwan and South Korea, for example, have per capita incomes typical of advanced economies, yet MSCI still classifies them as emerging because of historical constraints on foreign capital flows.

The practical result is that an investor who only buys an MSCI World ETF is, implicitly, excluding countries that together produce roughly 40 percent of world GDP.

Who Emerging Markets Really Are

The phrase “emerging markets” often conjures a generic image of poor or unstable countries. The actual composition of the MSCI Emerging Markets IMI index tells a different story: it is dominated by Asian economies that are already technologically and industrially advanced.

Taiwan and South Korea together outweigh China alone, and are home to some of the most important companies in the world in semiconductors and consumer electronics, a detail that undercuts the idea that “emerging markets” automatically means “underdeveloped economies.”

This also means an emerging markets ETF is far from a uniform basket: it is a combination of very different economies in terms of structure, political risk and growth cycle, from Taiwanese high-tech manufacturing to Indian demographic growth to Brazilian commodity exports.

Twenty Years of Return and Volatility: What History Actually Shows

Looking at market cycles over the past two decades, emerging markets have alternated periods of growth well above developed markets with periods of sharp underperformance, often tied to specific shocks: the 2008 global financial crisis, the mid-2010s Chinese growth slowdown, and the long stretch of Chinese regulatory tightening between 2021 and 2022, which hit the country’s technology and property stocks hard.

The pattern that emerges is consistent with basic financial theory: a higher expected growth potential, paired with historically higher volatility and deeper drawdowns during crisis periods compared with developed markets. This is not a statistical anomaly. It is the price the market demands for the added risk of investing in less mature, less liquid economies that are more exposed to discretionary political decisions.

Anyone looking only at the long-run average return risks underestimating how bumpy the road to get there actually was. In this asset class, the ability to stay invested through the worst periods matters at least as much as the initial decision to allocate capital to it.

The Specific Risks Worth Pricing In

Adding emerging markets to a portfolio means knowingly accepting a combination of risks that are far smaller in developed markets.

Currency risk. An emerging markets ETF is exposed to a basket of currencies, from the Chinese renminbi to the Brazilian real, that can move significantly against the euro in either direction. Unlike currency risk on the dollar or the yen (see the article on hedged versus unhedged ETFs ), currency-hedged versions for emerging markets are far less common and often more expensive, so most investors end up carrying the currency risk without an easy way to remove it.

Political and regulatory risk. This is the most cited risk and the hardest to quantify in advance. China’s 2021-2022 regulatory crackdown on technology, private education and the property sector wiped out a significant share of the market capitalization of some of the country’s largest companies within months, with none of the warning signs typical of an ordinary economic cycle.

Liquidity risk. Some smaller emerging markets have thin trading volumes and a narrower base of institutional investors, which can make it more expensive to buy or sell large positions without moving the price, especially during periods of market stress.

Geopolitical risk. Trade tensions, sanctions, regional conflicts: emerging markets are more exposed to geopolitical events that can have a direct and fast impact on valuations, a factor that in recent years has weighed especially on Chinese holdings and on some Eastern European markets.

None of these risks is a reason to avoid the asset class entirely. They are, instead, the variables that determine how much capital it is reasonable to expose to this kind of volatility.

How Much to Allocate: Three Different Approaches

There is no universally correct number, but there are three distinct approaches that lead to very different conclusions.

The market-cap approach. Investors who want to faithfully replicate the composition of the investable global stock market, through a single MSCI ACWI ETF or a combination of MSCI World and MSCI Emerging Markets in index proportions, end up with an emerging markets allocation of roughly 10 to 12 percent of their equity holdings. It is the most theoretically neutral approach, since it implies no active view on the relative overvaluation or undervaluation of either area.

The GDP-weighted approach. Investors who believe a country’s actual economic weight, not just the market capitalization available to foreign investors, should drive allocation reach a very different conclusion: an emerging markets exposure close to 35 to 40 percent, mirroring their share of world GDP at purchasing power parity. It is a theoretically defensible approach, but it carries far more risk than most retail investors are willing to accept.

The pragmatic satellite approach. The middle ground most common among investors building a lazy portfolio with a deliberate satellite component is an allocation between 5 and 10 percent of total equities to emerging markets, enough to partially correct for MSCI World’s exclusion without exposing the portfolio to disproportionate added volatility.

For most investors starting from an MSCI World-based portfolio, the pragmatic satellite approach offers the best balance between the diversification benefit and the added risk knowingly accepted.

How to Access Emerging Markets Through ETFs

Several ETFs tracking emerging markets indices are available on European exchanges, built on two very different replication approaches.

Physical replication. The iShares Core MSCI EM IMI UCITS ETF, with an annual TER of 0.18 percent, actually buys the stocks that make up the index. It is the most transparent and widely used approach among investors following a lazy portfolio logic, since the fund genuinely holds the underlying assets and its value directly reflects the real basket of stocks.

Synthetic replication (swap-based). ETFs such as the Xtrackers MSCI Emerging Markets Swap UCITS ETF do not buy the index’s underlying stocks directly. Instead they enter into a swap contract with a financial counterparty that commits to delivering the index return in exchange for a fee. This approach can, in some cases, offer more efficient tax treatment of dividends from certain countries thanks to how the swap handles withholding tax, but it introduces additional counterparty risk, capped under UCITS rules at a maximum of 10 percent of the fund’s value per single counterparty.

For investors who prioritize simplicity and transparency, physical replication generally remains the default choice. Synthetic replication can make sense for those who knowingly judge the potential tax advantage as outweighing the added counterparty risk, but it requires reading the fund’s KID carefully to understand exactly how the swap is structured.

A Worked Example

Take an investor with a 40,000 euro equity portfolio, currently 100 percent invested in an MSCI World ETF. They decide to apply the pragmatic satellite approach and bring emerging markets exposure to 8 percent of total equities.

That means allocating 3,200 euros to the emerging markets ETF, proportionally reducing the MSCI World position to 36,800 euros. The most tax-efficient way to do this operationally is not selling part of the existing MSCI World position, which would trigger an unnecessary taxable gain, but directing new monthly contributions to the emerging markets ETF until the target proportion is reached, leaving the existing position untouched.

If the investor contributes 300 euros a month, directing roughly 100 of it to the emerging markets ETF and 200 to the MSCI World ETF for a defined period is a practical, tax-efficient way to gradually reach the target allocation without disturbing capital already invested.

How Wallible Helps You Weigh the Impact on Your Portfolio

Before adding an emerging markets component, it helps to see in advance how the overall risk profile of the portfolio would change, not just in expected return but in volatility and drawdown during historical periods of stress. With Wallible you can simulate adding an emerging markets ETF to your existing portfolio and compare the risk metrics before and after, instead of deciding the allocation on intuition alone.

Next Step

Emerging markets are not a marginal option to ignore for convenience. They are a huge slice of the world economy that most MSCI World-only portfolios are excluding almost entirely. Deciding deliberately how much weight to give them, with which instrument and at what pace, is a genuine portfolio decision, not a secondary detail.

With Wallible you can:

• Simulate the impact of an emerging markets ETF on your portfolio and compare return, volatility and drawdown before and after
• Explore the logic of a diversified portfolio in the article on the lazy portfolio
• Learn how to manage currency risk on foreign holdings in the guide to hedged versus unhedged ETFs
• Check whether your portfolio already has a geographic concentration problem in the article on home bias among Italian investors