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If you hold any international stocks, bonds, or funds, currency moves are quietly shaping your returns. Here's how.

The hidden second engine

When you own a foreign stock, you actually hold two assets: the stock itself and the foreign currency it's priced in. Both move independently. Both affect your returns.

A 10% gain in a Japanese stock with a 10% drop in the yen is essentially a flat year for a U.S.-based investor. A 5% gain in the same stock combined with a 5% rise in the yen produces over 10% total return.

This is currency exposure, and almost every internationally diversified portfolio has it.

How it works in practice

Suppose you're a U.S. investor and you buy €10,000 of a German stock at EUR/USD = 1.10. Cost: $11,000.

A year later:

• The stock is up 10% in EUR — now worth €11,000.
• EUR/USD is now 1.05 (euro weaker).
• USD value: €11,000 × 1.05 = $11,550.

Stock-only return: +10%. Total USD return: +5%. The currency took half your gain.

The hedged-fund alternative

Many international ETFs and mutual funds offer currency-hedged versions:

• Unhedged: you take both stock and currency exposure.
• Hedged: the fund uses forwards to neutralize currency moves; you get pure stock return.

Examples:

• iShares Currency Hedged MSCI EAFE ETF (HEFA) vs. unhedged EFA.
• WisdomTree Japan Hedged Equity (DXJ) vs. unhedged EWJ.

Hedged funds aren't universally better. They cost slightly more (hedging spreads) and can underperform when foreign currencies strengthen.

When to hedge and when not to

Hedge when:

• You believe the foreign currency will weaken vs. yours.
• You want isolated exposure to the foreign equity market.
• You're investing for a specific home-currency liability (a future house purchase, college tuition).

Don't hedge when:

• You want diversification benefits from holding foreign currencies.
• You're a long-term investor who can ride out cycles.
• The foreign currency historically appreciates vs. yours.
• Hedging costs are unusually high (e.g., when interest-rate differentials widen).

The diversification argument

Holding foreign currencies in your portfolio diversifies against your home-currency risk. If the U.S. dollar collapses, your unhedged international holdings cushion the blow.

This is why many advisors recommend leaving at least part of international equity exposure unhedged.

Currency in bond portfolios

Currency matters even more for bonds. A 5% bond yield can be wiped out in a single year by a 5% currency drop. Most international bond funds are fully hedged by default for this reason.

Practical guidance for individuals

1. Know what you own. Check whether your international ETFs are hedged or unhedged.
2. Consider home-bias logic. Some home-currency concentration is rational if your liabilities (mortgage, expenses) are in that currency.
3. Don't try to time currencies. Even professionals get this wrong consistently.
4. For bonds, hedge. For stocks, mix or stay unhedged.
5. Re-examine after major currency moves. A 20% USD rise can quietly raise your foreign exposure as a share of your portfolio.

A simple rule of thumb

For a long-term portfolio:

• Domestic stocks: 50–70%.
• International stocks: 20–40% (mostly unhedged).
• International bonds: 0–15% (mostly hedged).

Adjust based on your home country, liabilities, and risk tolerance.

Key takeaways

• Every foreign holding has dual exposure: asset + currency.
• Currency hedging removes FX risk but adds cost.
• Stocks usually do well with some unhedged FX exposure; bonds usually don't.
• Diversification across currencies is a feature of international investing, not a bug.

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