real interest rate

US /ˌriːəl ˈɪn.tər.ɪst ˌreɪt/
UK /ˌriːəl ˈɪn.tər.ɪst ˌreɪt/
"real interest rate" picture
1.

the rate of interest an investor expects to receive after allowing for inflation

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The real interest rate is crucial for understanding the true cost of borrowing.
If inflation is higher than the nominal interest rate, the real interest rate can be negative.