Example

Calculating the Minimum Required Foreign Interest Rate

This example calculates the minimum interest rate required for a South African rand-denominated asset to be attractive to a US investor. Given a US policy rate (ii^*) of 4% and an expected rand depreciation (δE\delta^E) of 2.5%, the interest rate on the rand asset (ii) must at least compensate for this depreciation. Therefore, the minimum required interest rate is found by adding the expected depreciation to the US rate: ii+δEi \ge i^* + \delta^E, which means i0.04+0.025=6.5%i \ge 0.04 + 0.025 = 6.5\%. Unless the South African policy rate is at least 6.5%, the investor would not consider the investment.

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Updated 2026-05-02

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