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I am looking real interest rate from It shows me real interest rate for USA in 2010 was 3%. Does this mean money would increase 3% a month, or 3% a year?

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Important to note, there are times the data will be offered for a month, but annualized, as in "the October inflation rate was an annualized 3%" which simply means if inflation were the same as October for a full 12 months, it would be 3% inflation over that year. – JoeTaxpayer Dec 31 '12 at 18:51

3% in a year. 3% a month would be an enormously high interest rate.

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