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This is the formula that was used for the old Financial Times stock market index (the predecessor of the FTSE 100 Index). It was inadequate for that purpose. It was inadequate for that purpose. In particular, if the price of any of the constituents were to fall to zero, the whole index would fall to zero.
A producer price index (PPI) is a price index that measures the average changes in prices received by domestic producers for their output. Formerly known as the wholesale price index between 1902 and 1978, the index is made up of over 16,000 establishments providing approximately 64,000 price quotations that the U.S. Bureau of Labor Statistics (BLS) compiles each month to represent thousands ...
The first mechanically powered submarine, the 1863 French submarine Plongeur, used a compressed-air engine. Musée de la Marine (Rochefort). A pneumatic motor (air motor), or compressed-air engine, is a type of motor which does mechanical work by expanding compressed air. Pneumatic motors generally convert the compressed-air energy to ...
The two most basic formulae used to calculate price indices are the Paasche index (after the economist Hermann Paasche) and the Laspeyres index (after the economist Etienne Laspeyres [lasˈpejres]). The Paasche index is computed as
A hydraulic compressor is a means of compressing air using hydraulic energy. There are two very different types of machines referred to as hydraulic compressors. One type is a mechanical air compressor that is driven by a hydraulic motor. It is a method of converting hydraulic power to pneumatic power. [1]
A Divisia index is a theoretical construct to create index number series for continuous-time data on prices and quantities of goods exchanged. The name comes from François Divisia who first proposed and formally analyzed the indexes in 1926, and discussed them in related 1925 and 1928 works.