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SI derived units are units of measurement derived from the seven SI base units specified by the International System of Units (SI). They can be expressed as a product (or ratio) of one or more of the base units, possibly scaled by an appropriate power of exponentiation (see: Buckingham π theorem).
Economic historian Mark Blaug has called the quantity theory of money "the oldest surviving theory in economics", its origins originating in the 16th century. [1] Nicolaus Copernicus noted in 1517 that money usually depreciates in value when it is too abundant, [2] which is by some historians taken as the first mention of the theory.