Final answer:
The Fisher equation states that the real interest rate equals the nominal interest rate minus the rate of inflation. In this case, the nominal interest rate is 10% and the deflation rate is 5%. Therefore, the real interest rate is 15%.
Step-by-step explanation:
The Fisher equation states that the real interest rate equals the nominal interest rate minus the rate of inflation. In this case, the nominal interest rate is 10% and the deflation rate is 5%. Therefore, the real interest rate can be calculated as follows:
Real Interest Rate = Nominal Interest Rate - Inflation Rate
Real Interest Rate = 10% - (-5%)
Real Interest Rate = 10% + 5% = 15%
So, when the nominal interest rate is 10% and deflation is 5%, the real interest rate is 15%.