What Is the Real Interest Rate?
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0:00 - 0:02♪ [music] ♪
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0:13 - 0:16- [Narrator] What is
the real interest rate? -
0:16 - 0:19Well, first let's start with
what the nominal interest rate is. -
0:19 - 0:23That's the interest rate you see
on a bank or credit card statement. -
0:23 - 0:25So when people say interest rate,
-
0:25 - 0:28they usually mean
nominal interest rate. -
0:28 - 0:29To see the difference
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0:29 - 0:31between nominal
and real interest rates, -
0:31 - 0:32let's turn to an example.
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0:33 - 0:38Suppose that a bank lends $100
at a nominal interest rate of 10%, -
0:38 - 0:41but suppose also that over the year
the inflation rate is 10%. -
0:42 - 0:43At the end of that year,
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0:43 - 0:47the borrower
pays back the bank $110. -
0:47 - 0:49That looks pretty good on paper,
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0:49 - 0:51but during the year,
money has become less valuable. -
0:52 - 0:56Due to inflation, what used
to cost $100 now costs $110. -
0:56 - 0:59So what is the bank's real return?
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0:59 - 1:00Zero.
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1:00 - 1:03More generally, we can write
that the real interest rate -
1:03 - 1:07is equal to the nominal rate,
the rate charged on paper, -
1:07 - 1:09minus the inflation rate.
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1:09 - 1:12Inflation reduces
the real return on a loan. -
1:12 - 1:16So unexpected inflation
can redistribute wealth -
1:16 - 1:18from the lender to the borrower,
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1:18 - 1:22and that's exactly what happened
in the 1970s in the United States. -
1:22 - 1:23Suppose, for example,
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1:23 - 1:26that you had taken out
a home mortgage in the 1960s. -
1:26 - 1:29As a borrower,
you'd have done really well -
1:29 - 1:31because few people anticipated
-
1:31 - 1:33the high inflation rates
of the 1970s. -
1:33 - 1:36So borrowers ended up paying off
their mortgages in dollars -
1:36 - 1:40that were worth a lot less
than anyone had expected. -
1:40 - 1:43As you can see, in order
to understand interest rates, -
1:43 - 1:45understanding inflation is crucial.
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1:47 - 1:50If you'd like to learn more
about inflation, click here. -
1:50 - 1:52Or, if you'd like
to test your knowledge -
1:52 - 1:54on the real interest rate,
click here. -
1:54 - 1:56♪ [music] ♪
-
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-
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- Title:
- What Is the Real Interest Rate?
- Description:
-
The “interest rate” you see on paper on your credit card or loan statement is actually the nominal interest rate. So what are you actually paying?
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- Team:
- Marginal Revolution University
- Project:
- Dictionary of Economics
- Duration:
- 02:07
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