Understanding Currency Risk in Global Investing: The Variable Most Returns Overlook

When people first invest internationally, most focus only on how the asset itself performs. If a U.S. stock ETF rises 8%, for example, it is easy to assume your return is also 8%. In reality, your effective return is the combined result of the asset's performance and the change in exchange rates.

In other words, international investing involves two variables at once: what you bought, and how the currency you invested in moved relative to your home currency over the holding period. Without separating these two factors, you risk misreading your results — or fearing currency fluctuations more than necessary.

1. International investment returns move in two layers

The outcome of a foreign asset investment typically breaks down into two components:

1. Local asset return How much the asset — a stock, ETF, or bond — gained in its own local currency.
2. Currency effect How the value of that currency changed relative to your home currency between the time you invested and the time you withdrew.

For example, even if the local asset gains 10%, a 7% decline in the investment currency against your home currency will significantly reduce your effective return. Conversely, if the asset rises only 5% but the exchange rate moves in your favor, your return may feel considerably larger.

This is why evaluating international investment performance requires asking what actually drove the result — whether it was good asset selection or whether the exchange rate simply happened to help.

2. Currency risk is not always a bad thing

Exchange rates are often described purely as a risk, but in practice they are closer to an additional source of volatility. While that can feel uncomfortable, it is difficult to argue that currency exposure should be entirely eliminated from a long-term, globally diversified portfolio.

Here is how currency movements typically affect the investor's experience:

The key point is that predicting short-term currency movements is extremely difficult. For long-term investors, it is generally more useful to ask whether the resulting volatility is something you can tolerate rather than trying to forecast where exchange rates are headed.

3. When to consider currency-hedged products

When investing internationally, you will often face the choice between currency-hedged and unhedged products.

Unhedged

You accept currency fluctuations as they come. Over the long term, the simpler structure and the added benefit of currency diversification can work in your favor. Short-term performance swings, however, may be larger.

Currency-hedged

You pay a hedging cost to reduce currency exposure. This can be useful for funds earmarked for near-term spending, or for investors who find currency volatility genuinely hard to bear. The trade-off is that hedging carries a cost and may not track as cleanly over the long run as you might expect.

The decision framework is straightforward. If your goal is long-term wealth accumulation, unhedged exposure is often the natural choice. If the money will be spent in your home currency in the near future, a hedged product may be more appropriate.

4. Currency risk is not a reason to avoid global diversification

Many investors delay international investing because exchange rates feel intimidating. The result, however, is often a portfolio excessively tied to a single country, a single currency, and a single market. That, too, is a form of concentration risk.

The more important question in international investing is not "will the exchange rate go up or down?" but rather whether your assets are overly concentrated in one region and one currency. For long-term investors, building a structure with exposure to multiple currencies and markets is generally more rational than attempting to predict exchange rate direction.

5. A better way to interpret results in practice

When currency movements make your investment returns feel unsettling, work through them in this order:

• Did the underlying asset actually perform well in local terms?
• How much did the result change when converted to your home currency?
• Is your discomfort driven by an actual loss, or by a gap in understanding?

Repeating this process shifts your perspective: rather than treating the exchange rate as something you need to predict correctly, you begin to treat it as one risk factor among many within your portfolio.

Frequently asked questions

Q. Should I avoid international investing when exchange rates are unfavorable? Not necessarily. Exchange rates can be unfavorable in the short term, but from a long-term asset allocation perspective, diversifying across markets and currencies may matter more.

Q. Should I always wait when exchange rates seem high? In many cases, investors who try to time both exchange rates and asset prices end up doing nothing at all. For long-term investing, approaches that reduce timing pressure — such as regular, periodic contributions — tend to be more practical.

Q. Is it acceptable to hold retirement savings in international assets? It is. However, as the withdrawal date approaches, you should account for how currency fluctuations could affect your actual living expenses. Funds needed in the near term are generally better managed conservatively.

[WARNING] This guide is general information intended to help you understand the relationship between international investing and exchange rates. Currency movements are inherently difficult to predict, and their impact varies significantly depending on the asset type and investment horizon. Rather than making short-term bets based on a specific currency outlook, it is more important to first establish an asset allocation framework that considers your home currency and your expected spending timeline.