Formula

Approximation Formula for Foreign Investment Return in Home Currency

For a global investor, the nominal rate of return on a foreign asset, when converted back to the investor's home currency (RORn\text{ROR}_n^*), can be approximated. The formula subtracts the expected rate of depreciation of the foreign currency (δ\delta) from the nominal interest rate of the foreign asset (ii). For a US investor buying South African bonds, ii would be the South African policy rate, and δ\delta would be the expected depreciation rate of the rand against the dollar. The formula is: RORniδ\text{ROR}_n^* \approx i - \delta.

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Updated 2026-05-02

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