The general Bell's theory for the creation, evolution, and death of various priced-based computer classes, explaining the history of computing industry based on the properties of computer classes and their determinants, is presented. The Bell's theory maintains that the class establishe a horizontally structured industry composed of hardware components through operating systems, languages, application programs, games, images, songs, and videos. A new computer class forms as a new minimal computer either through using fewer components or use of a small fractional part of the state-of-the-art chips. Bell's theory also states that microprocessors are rated as an evolving force for classes, while CMOS Microsystems on a chip establish new classes using smaller and less expensive chips.
