Suppose you make a loan of $100 that will be repaid to you in 1 year. If the loan is denominated in terms of a nominal interest rate, are you happy or sad if inflation is higher than expected during the year? What if the loan instead had been denominated in terms of a real return?
If the inflation will be higher the expected and the loan is denominated in teams of the normal rate which is the sum of real interest plus the inflation rate then I will be disappointed to repay more than what I expect to pay since the increase in the inflation rate will cause an increase in the nominal rate. However, if the loan is dominated in terms of real returns, I will be advantaged because real returns are always lower than nominal returns which do not subtract taxes, and inflations.
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