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Currency and Country Risk

Local Currency vs. USD Returns Compared

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Local Currency vs. USD Returns Compared—Why Currency Depreciation Erases Equity Gains

An emerging-market equity investment returns compound value in two ways: equity price appreciation in local currency and currency appreciation against the US dollar. A Brazilian stock that rises 20% in real terms but whose currency (the real) depreciates 30% against the dollar produces a net USD return of -13% to a US investor. The equity outperformance is entirely erased by currency losses. Conversely, a Mexican stock that rises only 5% in peso terms can deliver 15% USD returns if the peso appreciates sharply. Currency is not a secondary consideration; it is a co-equal determinant of final returns for foreign investors. This article explores the mechanics of local-currency versus USD returns, how currency moves amplify or erase equity returns, and how to structure hedges to isolate equity returns from currency movements.

Quick definition: Local-currency returns are equity returns measured in the stock's home currency (e.g., Brazilian real for a Brazil-listed stock). USD returns are the same equity returns converted to US dollars. The difference between them is currency-return contribution: appreciation strengthens returns, depreciation weakens them. Currency effects often exceed 50% of equity returns over 5–10 year periods.

Key takeaways​

  • Currency returns are additive to equity returns; total USD return = (1 + local equity return) × (1 + currency return) - 1.
  • Emerging-market currencies typically depreciate against the dollar over multi-year periods due to inflation differentials and interest-rate gaps; this erodes USD returns for foreign investors.
  • Currency headwinds are largest in high-inflation countries (Argentina, Turkey, Venezuela) where inflation exceeds dollar inflation by 10%+ annually.
  • Hedging currency exposure isolates equity returns but eliminates currency upside; it converts an unhedged position (equity + currency bet) into a currency-neutral equity bet.
  • Portfolio construction requires decisions about whether to hedge currency, accept unhedged currency exposure, or selectively hedge high-depreciation-risk countries.

Understanding the mechanics: How currency affects returns​

The mathematical relationship between local-currency and USD returns is:

USD return = (1 + local equity return) × (1 + currency return) - 1

Or approximately, for small returns: USD return ≈ local equity return + currency return

Example:

A Korean investor holds Samsung, a South Korean company. Over one year:

  • Samsung's stock rises 15% in Korean won (equity return: +15%)
  • The won appreciates 10% against the dollar (currency return: +10%)
  • USD return to a US investor: (1.15 × 1.10) - 1 = 1.265 - 1 = 26.5%

The US investor captures both the 15% equity appreciation and the 10% currency appreciation. The two compound together.

Contrasting case:

An Argentine investor holds an Argentine bank stock. Over one year:

  • The bank stock rises 20% in Argentine pesos (equity return: +20%)
  • The peso depreciates 40% against the dollar (currency return: -40%)
  • USD return to a US investor: (1.20 × 0.60) - 1 = 0.72 - 1 = -28%

Despite a 20% local-currency equity gain, the US investor suffers a 28% loss due to currency depreciation overwhelming the equity gain.

This dynamic is critical: the sequence and magnitude matter. Large equity returns can be entirely erased by currency depreciation. Conversely, currency appreciation can create positive returns even from negative local-currency equity performance.

Real-world case: Mexico 1994–1995 and the currency crisis destroying equity gains​

Mexico's 1994 currency crisis offers a clear illustration of currency's impact.

Pre-crisis (early 1994): Mexico's stock market (the Bolsa) had appreciated strongly through 1993–1994, with many stocks up 30–50% in peso terms. Mexico was seen as a stable emerging market with good growth prospects. US investors holding Mexican equities viewed their positions favorably.

Late 1994 crisis: Mexico's central bank, under political pressure to maintain an artificially overvalued peso peg, exhausted its dollar reserves defending the currency. In December 1994, the peso collapsed, depreciating from 3.5 pesos per dollar to 6+ pesos per dollar—a 40%+ depreciation in weeks.

Investor outcomes:

  • Local-currency returns (in pesos): Several Mexican stocks had appreciated 30–40% in peso terms through 1994. These local-currency returns were real equity appreciation driven by earnings growth and valuations expansion.
  • USD returns: Despite the strong local-currency performance, US investors who held through the crisis suffered massive losses. A stock that was up 30% in pesos and down 0% in dollar terms (hypothetically) would actually be down 23% in dollars (1.30 × 0.60 - 1 = -22%). Most Mexican equities fell in both currencies, compounding the loss.
  • Total loss for US investors: Many Mexican equity positions declined 40–60% in USD terms as the combination of local-currency depreciation and local equity-price decline created compounding losses.

The critical lesson: currency depreciation can destroy returns that look attractive in local-currency terms. US investors who believed they were getting "Mexican economic growth" discovered they were also taking a "peso depreciation bet." When the peso collapsed, the bet soured.

Why emerging-market currencies depreciate: Interest-rate parity and inflation differentials​

Emerging-market currencies tend to depreciate against developed-market currencies over multi-year periods. Why?

Purchasing-power parity (PPP): Over long horizons, currencies appreciate or depreciate to maintain equal purchasing power across countries. If Country A has 8% annual inflation and Country B has 2% inflation, PPP suggests Country A's currency should depreciate approximately 6% per year relative to Country B's currency. The nominal depreciation offsets the inflation differential, leaving relative prices stable.

Interest-rate differential: Investors require higher returns in higher-inflation-risk countries. If inflation is expected to be 8% in Country A and 2% in Country B, interest rates should be roughly 6% higher in Country A (to provide the same real return). This interest-rate differential is reflected in forward currency contracts and serves as a proxy for expected depreciation. If you can earn 9% in Country A and 3% in Country B (a 6% spread), the currency is expected to depreciate 6%, leaving the USD-converted return equal across countries (in equilibrium).

Capital flows and reserve depletion: Countries with persistent current-account deficits—spending more on imports than earning from exports—must finance deficits through capital inflows or reserve depletion. As reserves decline, currency depreciation accelerates. Emerging markets often run current-account deficits; capital outflows then trigger depreciation.

Inflation surprises: If inflation in an emerging market exceeds expectations, the currency depreciates further than interest-rate differentials alone suggest. Investors flee inflation-prone currencies.

Quantifying currency impact: Historical examples​

Brazil, 2000–2025: Over 25 years, Brazil's BOVESPA index (in real terms) has appreciated approximately 150–200%. However, the Brazilian real has depreciated from 1.8 to 5.2 per dollar—a 66% depreciation. A US investor who bought the entire Brazilian market in 2000 would have seen local-currency gains of ~150–200% erased substantially by currency depreciation, resulting in USD gains of perhaps 20–40% total over 25 years. The equity appreciation was offset partially, not entirely, by currency depreciation.

Turkey, 2010–2025: Turkish equities rose substantially in lira terms over this period, but the lira collapsed from 1.5 to 30+ per dollar—a 95%+ depreciation. USD investors who held Turkish equities suffered horrific returns despite solid local-currency gains, because the currency losses overwhelmed the equity gains.

India, 2000–2025: The Indian rupee depreciated from 45 to 85 per dollar over 25 years, a roughly 47% depreciation. But Indian equities appreciated substantially in rupee terms. US investors in Indian equities captured the equity appreciation but gave up roughly half of it to currency depreciation, resulting in strong but not exceptional USD returns.

South Korea, 1990–2000: The Korean won depreciated sharply during the 1997 Asian financial crisis. However, long-term (1990–2025), the won appreciated from 700 to 1300 per dollar, actually strengthening slightly in real terms. US investors holding Korean equities benefited from modest currency appreciation on top of substantial equity gains.

The pattern: Across emerging markets, equity returns in local currency tend to exceed USD returns, because currencies depreciate over multi-year periods. The depreciation is not complete (most currencies don't become worthless), but it's substantial.

Currency-hedging mechanics and the hedge-or-not decision​

Currency hedging works by locking in an exchange rate through forward contracts or currency swaps. A US investor holding Brazilian equities can hedge currency by selling Brazilian reals forward, locking in the current exchange rate.

Mechanics:

An investor holds $1 million in Brazilian equities worth 5 million reals (at 5 reals per dollar). Over the next year, the investor expects 15% local-currency returns, delivering 5.75 million reals. But the investor is concerned the real will depreciate.

The investor enters a forward contract: sell 5.75 million reals in one year at today's forward rate (approximately 5.3 reals per dollar, assuming a 1.7% forward depreciation premium).

Outcomes:

  • If the real actually depreciates to 6 per dollar (as feared): The investor's unhedged position would be worth 5.75M / 6 = $958k, a loss despite positive local returns. The hedged investor converts at 5.3 reals per dollar, receiving $1.085M.
  • If the real appreciates to 4.8 per dollar (contrary to expectations): The unhedged investor would receive 5.75M / 4.8 = $1.198M, capturing both local-currency and currency gains. The hedged investor still receives $1.085M, missing the currency upside.

The decision: Hedging converts a "local-currency equity plus currency bet" into a "local-currency equity only" bet. The hedge costs something (the forward rate typically implies a small depreciation premium) but eliminates currency volatility.

Portfolio considerations:

  • High-conviction local-equity bets: If you have high conviction that Brazilian equities will outperform, hedge currency to isolate equity returns. This captures your equity view without currency noise.
  • Currency-upside bets: If you believe a currency will appreciate, leave it unhedged to capture currency gains. This assumes currency strength correlates with or exceeds equity returns.
  • Diversified emerging-market portfolios: Partial hedging (hedge 50% of currency exposure) balances currency-risk reduction with retention of some upside.
  • High-inflation countries: In countries with persistent inflation higher than the dollar, currency depreciation is likely (PPP suggests it). Hedging reduces drag.

Real-world example: Hedged vs. unhedged international returns​

Consider a comparison of hedged and unhedged exposure to MSCI Emerging Markets Index, 2010–2020:

Unhedged returns (in USD): MSCI Emerging Markets Index returned approximately 6–7% annually in USD terms.

Hedged returns (in USD, with currency hedging): MSCI Emerging Markets Index returned approximately 11–12% annually when currency-hedged.

Why the large difference?

Emerging-market currencies depreciated during this decade due to interest-rate differentials, China's growth slowdown, and commodity-price declines. Unhedged investors suffered currency drag. Hedged investors eliminated this drag, capturing pure equity returns.

This reverses common intuition: hedging improved returns in this period, because emerging-market currency depreciation was a headwind. This highlights that hedging is not universally better or worse; it depends on actual currency movements. The investor who hedged benefited from eliminating currency depreciation; the unhedged investor suffered from it.

Building currency-aware international portfolios: Hedge ratios and decisions​

Several frameworks guide hedging decisions:

Strategic allocation by country: Allocate a percentage of emerging-market exposure to countries you believe have strong currency tailwinds (e.g., those with growing reserves, improving current accounts, rising interest rates relative to the US). Leave these unhedged. Allocate another percentage to countries with depreciation risks (high inflation, deficit countries), and hedge these.

Dynamic hedging based on valuation: If a currency is historically expensive (strong real exchange rate), hedge it. If it's historically cheap (weak real exchange rate), leave it unhedged, betting on mean reversion. This requires assessing whether a currency is over- or under-valued relative to long-term norms.

Sector-based hedging: Exporters in emerging markets benefit from local-currency depreciation (their exports become cheaper competitively). Domestic-focused businesses suffer from depreciation (they pay import costs in stronger foreign currency). Hedge domestically-focused businesses; leave exporters unhedged.

Lifecycle hedging: Early in an emerging market's development cycle, currencies often appreciate (inflows, rising productivity). Later, as growth matures, currencies depreciate. Adjust hedging based on life-cycle phase.

Common mistakes investors make with currency and returns​

Mistake 1: Ignoring currency effects and attributing all returns to equities. An investor might see "Brazil +20% YoY" and assume they captured 20% returns. But if the real depreciated 15%, the true USD return was only 2% (1.20 × 0.85 - 1). Currency is half the equation; ignoring it leads to misunderstanding of true returns and unintended currency-bet sizing.

Mistake 2: Believing currency hedging is expensive and always reduces returns. Hedging does have costs (the forward premium), but it also eliminates tail risk. In some periods (like 2010–2020 for emerging markets), hedging improved returns. The decision should be tactical and deliberate, not based on a blanket assumption that hedging is expensive.

Mistake 3: Hedging selectively in ways that create currency bets. If you hedge Brazil but not India, you're making a currency bet: that the rupee will outperform the real. This is a bet, not a diversification decision. Either hedge consistently across all emerging markets or deliberately position currency bets separately from equity bets.

Mistake 4: Not adjusting hedges as conditions change. Interest-rate differentials, inflation expectations, and capital flows change. A currency that justified hedging in 2022 might not in 2024. Rebalance hedging dynamically; don't set it and forget it.

Mistake 5: Assuming small currency movements are irrelevant. A 15% annual currency depreciation compounds to 50%+ over 3 years. Small annual currency movements are large over multi-year horizons. Track and adjust for them.

FAQ​

How do I compare USD returns to local-currency returns for international stocks I own?​

Look up the stock's local-currency return (from local exchanges or Bloomberg) and the currency return (e.g., if the real was 5 per dollar at the start and 5.2 at the end, the depreciation is 4%). Combine them: USD return ≈ (1 + local return) × (1 + currency return) - 1. Or simplify: USD return ≈ local return + currency return for approximations.

Should I hedge all my international equity exposure, or just some?​

A balanced approach: fully hedge high-inflation, likely-to-depreciate currencies (Argentina, Turkey, parts of emerging markets with persistent inflation). Partially hedge (50%) moderate-risk currencies (Brazil, Mexico, India). Leave currencies with appreciation tailwinds unhedged (South Korea, Taiwan). This balances risk reduction with optionality.

What's the cost of hedging currency?​

The cost is embedded in the forward exchange rate, typically a small premium (1–3% annually) reflecting interest-rate differentials. So if you hedge, you implicitly accept that small cost in exchange for eliminating currency volatility. Over multi-year periods, the cost compounds but is usually modest (3–10% cumulative).

Can currency hedging create losses if the currency appreciates?​

Yes. If you hedge a currency that then appreciates 20%, you miss the 20% gain because the forward rate was locked in lower. The hedge "costs" you the missed currency upside. This is the trade-off: hedging eliminates downside currency risk but also caps upside. This is intentional; you're trading potential gains for risk reduction.

How do interest rates affect currency forward rates and hedging costs?​

Interest-rate differentials determine forward rates. If the US rate is 5% and Brazil's is 12%, the Brazilian real is expected to depreciate roughly 7% annually (the interest-rate differential). A forward contract to sell reals in one year will lock in a rate that reflects this 7% depreciation premium. Higher interest rates in emerging markets translate to more expensive hedging (larger forward premiums).

Is there a difference between hedging equities and hedging bonds in terms of currency?​

No, the mechanics are identical. A forward contract locks in a currency exchange rate. Whether you're hedging equity or bond exposure doesn't change the forward contract's cost or mechanics. Both experience currency exposure and both can be hedged the same way.

What if I want to hedge currency but maintain some upside?​

Use options or collars. Buy a put option on the currency (capping downside) while selling a call option (capping upside). This creates a range: if the currency is within the range, you have no hedge cost; if it moves beyond the range, your loss or gain is capped. This is more expensive than forward contracts but provides asymmetric protection.

Understand currency returns within these broader investment frameworks:

Summary​

Currency is co-equal to equity returns in determining USD-denominated outcomes for foreign investors. Emerging-market currencies depreciate systematically due to inflation differentials and interest-rate gaps, eroding USD returns from local-currency equity gains. The depreciation is not unpredictable; it follows purchasing-power parity and interest-rate parity relationships. Sophisticated investors can position deliberately: hedge currencies in countries with high depreciation risk (high inflation, current-account deficits), leave currencies with appreciation potential unhedged, and diversify across currency regimes. Over multi-decade periods, currency management differentiates investors who separate equity performance from currency performance, isolating and capturing returns from each. Treating currency as a secondary consideration is false economy; it accounts for 30–50% of long-term international returns and deserves equal attention to equity selection.

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