Currency risk

Currency risk is the FX-rate volatility that lives between an investor and any asset denominated in a different currency. A LATAM retail investor holding the S&P 500 owns a USD asset; the value reaches them as Mexican pesos or Brazilian reais only after a foreign-exchange step that happens twice, once at purchase and once at sale. In between, the FX rate moves continuously, and that movement enters the realised return at exit. Currency risk is not the same as inflation risk. Inflation erodes the local-currency purchasing power of any nominal balance over time. Currency risk reshapes the conversion arithmetic between two currencies on each transaction date. Both are real, both compound, and they are mathematically distinct.

The arithmetic that matters is multiplicative. A USD asset that returned plus 50 percent over a holding period lands at plus 24 percent in local-currency terms if the home currency appreciated 17 percent against the dollar, and at plus 80 percent if the home currency depreciated 20 percent. Same asset, same window, the local outcome ranges across more than 50 percentage points entirely because of the FX path. The wedge is asymmetric in LATAM: across 2010 to 2024 the Mexican peso depreciated 62 percent against the dollar, the Brazilian real 258 percent, the Colombian peso 130 percent. Every USD asset held by a LATAM retail investor over that window earned an FX boost on top of its underlying return. The same arithmetic in reverse hurts when local currencies appreciate.

Hedging removes the FX leg at a cost. A currency-hedged ETF locks the exchange rate at trade time and pays a small annual carry to the counterparty providing the lock; LATAM-cross hedging costs typically run 30 to 100 basis points per year. Hedging insulates the investor from FX moves in either direction. In a depreciating-currency regime hedging gives up the boost; in an appreciating-currency regime it avoids the drag. The choice is not free in either direction, and the right choice depends on whether the underlying asset's currency matches the investor's spending currency. The page that follows shows the FX wedge year by year and lays out the hedged-versus-unhedged numbers on real LATAM data.

LATAM retail lives with FX moves daily. From 2010 to 2024 the Brazilian real depreciated 258 percent against the dollar, the Mexican peso 62 percent, the Colombian peso 130 percent, the Chilean peso 112 percent, the Peruvian sol 35 percent. Several of those moves concentrated into 18 to 24 month windows that felt to households like overnight devaluations. A USD-denominated investment held through that period therefore earned two distinct returns at once: the underlying USD return, and the cumulative FX move into local-currency terms. For a Mexican household holding the S&P 500, the unhedged 2010 to 2024 outcome on $10,000 worth of pesos was roughly 114,000 MXN; the same investment with FX neutralised was roughly 70,000 MXN. The 44,000 MXN wedge was pure currency.

Four threads pull this together for the LATAM investor. First, FX volatility is a different mechanism from price-level erosion: inflation eats local-currency purchasing power over time, currency risk reshapes the cross-rate arithmetic at every conversion. Both are real; one is not a synonym for the other. Second, the apparent advantage of high local nominal yields on local-currency LATAM treasuries shrinks once a USD-base earner subtracts the FX move; the same yield that compounds wealth for a peso-spending family converts into a much smaller dollar return for a non-local-currency holder. Third, depository receipts do not bypass the FX leg: BDRs and ADRs are wrappers, not currency-conversion mechanisms, and the wrapper's settlement currency just moves where the FX step lives in the chain rather than removing it. Fourth, currency-bucket choice is an axis of asset allocation that US-only allocation guides ignore entirely; for a LATAM household the question is not stocks-versus-bonds in isolation but USD-stocks versus local-bonds versus USD-bonds, with currency as a moving part across all three.