International Diversification: Why and How to Invest Outside the United States

The United States represents approximately 60-65% of the world's total stock market capitalization. This means that investors who hold only US stocks are missing 35-40% of global equity market opportunity. The rest of the world — Europe, Japan, the United Kingdom, Australia, Canada, South Korea, Taiwan, India, Brazil, China, and dozens of other countries — offers thousands of publicly traded companies across every industry imaginable, often at more attractive valuations than US equivalents.

International diversification is one of the most debated topics in investing. After a decade of US stock market dominance (2010-2020), many investors questioned whether international stocks were worth owning at all. This view ignores longer historical evidence and the mathematical logic of global diversification. Understanding both the opportunity and the risks of international investing is essential for building a truly resilient portfolio.

Why International Diversification Matters

Cyclical Outperformance Rotates Between Regions

US stocks have dramatically outperformed international stocks over the past decade. This has led some investors to conclude that international stocks are permanently inferior. History suggests otherwise.

From 1970 to 1990, international developed market stocks outperformed US stocks by substantial margins. Japanese, German, and Swiss companies dominated many industries and delivered superior returns. From 2000 to 2010, international stocks again outperformed US stocks, benefiting from dollar weakness and emerging market growth.

Cycles of relative performance between US and international stocks have typically lasted 7-15 years. Investors who abandon international stocks after a decade of US outperformance are pattern-chasing historical trends rather than investing forward-looking.

Valuation Differences Create Opportunity

As of 2026, many international markets trade at significantly lower valuation multiples than US stocks. European and Japanese stocks trade at P/E ratios considerably below the S&P 500 average. This valuation gap can result in higher future returns from international stocks simply through valuation normalization, even without superior earnings growth.

Currency Diversification

For US investors, owning international stocks provides currency exposure. When the US dollar weakens, the dollar value of your international holdings rises (and vice versa). Over long periods, the dollar's value fluctuates in cycles, and international stocks provide natural hedge against extended dollar weakness.

Sector and Company Diversification

Some sectors are better represented in international markets than in the US:

• Luxury goods: LVMH, Hermes, Ferrari (Europe)
• Semiconductors: TSMC (Taiwan), Samsung (South Korea)
• Consumer goods: Nestle (Switzerland), Unilever (UK/Netherlands)
• Mining and resources: BHP, Rio Tinto (Australia/UK)
• Banking and financial services: HSBC, Standard Chartered (UK)

These world-class businesses are not available through a US-only portfolio.

The Structure of International Markets

Developed International Markets

Also called international developed or EAFE (Europe, Australasia, and Far East):

• Europe: Germany, France, UK, Switzerland, Netherlands, Sweden, Italy, Spain, and others. Home to many world-class multinationals in luxury, pharmaceuticals, financial services, and industrial manufacturing.
• Japan: The world's third-largest economy by GDP. Japanese stocks have historically traded at significant valuation discounts and are undergoing corporate governance reforms that may improve returns.
• Australia and Canada: Resource-rich economies with significant exposure to commodities, energy, and financial services.
• South Korea and Taiwan: Major technology manufacturers including Samsung, SK Hynix, and TSMC.

Emerging Markets

Faster-growing economies with younger demographics and expanding middle classes, but also higher volatility and political risk:

• China: Despite near-term challenges, the world's second-largest economy with a vast domestic consumer market.
• India: One of the fastest-growing major economies with favorable demographics. Significant long-term potential.
• Brazil: Latin America's largest economy, rich in natural resources and an expanding consumer class.
• Taiwan and South Korea: Technically classified as emerging markets by some indices due to capital flow restrictions, despite being developed high-income countries.
• Southeast Asia: Vietnam, Indonesia, Philippines — manufacturing hubs benefiting from supply chain diversification away from China.

How to Invest Internationally

International ETFs: The Easiest and Most Cost-Effective Approach

Broad International Funds:

• VXUS (Vanguard Total International Stock ETF): Covers over 7,500 stocks across 47 countries. Expense ratio: 0.07%
• IXUS (iShares Core MSCI Total International): Similar coverage. Expense ratio: 0.07%
• FZILX (Fidelity Zero International): Zero expense ratio, covers large and mid-cap international stocks

Developed Markets Only:

• VEA (Vanguard FTSE Developed Markets ETF): 24 developed countries ex-US. Expense ratio: 0.05%
• EFA (iShares MSCI EAFE ETF): Europe, Australasia, Far East

Emerging Markets:

• VWO (Vanguard FTSE Emerging Markets ETF): Broad emerging market exposure. Expense ratio: 0.08%
• EEM (iShares MSCI Emerging Markets ETF): More expensive at 0.68%
• IEMG (iShares Core MSCI Emerging Markets): Lower cost at 0.09%

Regional Funds:

• VGK (Vanguard FTSE Europe ETF): European stocks only
• EWJ (iShares MSCI Japan ETF): Japan only
• EWZ (iShares MSCI Brazil ETF): Brazil only
• INDA (iShares MSCI India ETF): India only

International ADRs: Individual Foreign Stocks on US Exchanges

American Depositary Receipts (ADRs) allow US investors to buy shares of foreign companies through US exchanges. Examples include:

• NESN.SW / NSRGY: Nestle (Switzerland) — largest food company in the world
• NOVN.SW / NVS: Novartis (Switzerland) — major pharmaceutical company
• ASML: ASML Holding (Netherlands) — monopoly supplier of EUV chip lithography machines
• TSM: Taiwan Semiconductor Manufacturing Company (Taiwan) — world's largest contract chipmaker
• SAP: SAP SE (Germany) — enterprise software leader
• TM: Toyota (Japan) — world's largest automaker

Risks of International Investing

Currency Risk

When the US dollar strengthens, the dollar value of international investments falls. A European stock may rise 10% in euros, but if the dollar strengthened 8% against the euro, your dollar-denominated return is only about 2%. Over long periods, currency effects tend to wash out, but in any given year they can significantly impact returns.

Currency-hedged ETFs (like HEFA — hedged Europe) neutralize this risk but add cost and complexity.

Political and Regulatory Risk

Foreign governments can impose capital controls, nationalize industries, or change regulations in ways that harm investors. Emerging markets are more vulnerable to political instability and sudden policy changes.

Accounting Standard Differences

Most countries outside the US use IFRS (International Financial Reporting Standards) rather than US GAAP. While similar in most respects, there are meaningful differences in how certain items are reported. Chinese companies, in particular, have faced scrutiny over accounting transparency.

Lower Liquidity

Smaller international markets may have less trading volume, resulting in wider bid-ask spreads and more difficulty exiting positions quickly. Less important for ETF investors but relevant for direct stock selection.

Geopolitical Risk

Conflict, sanctions, and geopolitical tensions can severely damage investments in affected countries. Russian stocks became essentially worthless for foreign investors following the 2022 invasion of Ukraine and subsequent sanctions.

Recommended International Allocation

Vanguard and most academic research suggests allocating international stocks proportionally to their share of global market capitalization — approximately 40% of equity exposure. Many US-focused investors find this uncomfortably high.

A practical middle ground for most US investors:

• 20-30% of equity allocation in international stocks
• Split roughly 70/30 between developed international and emerging markets
• Use low-cost ETFs rather than individual stock selection for most exposure

This provides meaningful diversification benefits without concentrating in international markets. Adjust based on your assessment of current relative valuations, with a bias toward increasing international exposure when US valuations appear stretched relative to historical norms.

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