Installed base (also install base, install[ed] user base or just user base) is a measure of the number of units of a particular type of system—usually a computing platform—actually in use, as opposed to market share, which only reflects sales over a particular period. Although the install base number is often created using the number of units ...
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A number which represents the number of households owning a particular game machine. For example, if a company has manufactured two million game machines but half a million of them are in stores and store warehouses, then the installed base is a million and a half (not two million).
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