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Series of formulas and equations related to the economics and finance are closely connected with the name of American economist and statistician I. Fisher. During a hundred years period of their usage some mistaken stereotypes appeared in application to their terminological monosemantics and practical use. The article draws attention to the “Fisher`s formula” which links the nominal and real interest rates through the level of inflation. The article reports on a new aspect of the I. Fisher`s formula which considers inflation. It turned out that there were two formulas not one as it was thought previously. Also, the article discovers the features of the practical application of these new formulas. Currently, one of these features is well-known, but the other two features are new.