Michael Zotov, CFA, is the economist and portfolio manager of the Zotov Investment Fund based in Germany. Zotov believes that the Polish economy is due for a significant recovery as a result of governmental austerity programs enacted this year. Nominal interest rates and inflation have begun to trend lower. For comparative purposes, he wanted to use Europe as a benchmark since most of his investor base is in Germany. The current spot exchange rate is 4.6404 Polish Zioty per euro. He wants to see if the ratio of interest rates between Poland and the European Economic Community (EEC) are the same as the ratio of inflation rates according to the international Fisher relation. The current nominal interest rate for the EEC is 11.76% and the annual inflation rate is 8.50%. The Polish nominal interest rate is 12.30% and the annual inflation rate is 9.00%. According to his calculations, the result of the international Fisher relation and its linear approximation are:
Using the international Fisher relation:Exact methodology: (1 + rFC) / (1 + rDC) = (1 + E(iFC)) / (1 + E (iDC))
Linear approximation: rFC – rDC = E(iFC) – E(iDC)
By substituting for the international Fisher relation: (1 + 0.123) / (1 + 0.1176) = (1 + 0.09) / (1 + 0.085)
1.123 / 1.1176 ≈ 1.09 / 1.085
1.0048 ≈ 1.0046
1.005 ≈ 1.005
By substituting for the linear approximation of the international Fisher relation: 0.123 – 0.1176 ≈ 0.09 – 0.085
0.0054 ≈ 0.0050
0.005 ≈ 0.005
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