Quaternary sector of industry
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The quaternary sector of industry is the sector of industry that involves the intellectual services. It was once considered just a subset of the general service-oriented tertiary sector of industry.
This includes the high tech industry, with information technology and some forms of scientific research, as well as education and consulting, and information industry.
According to some definitions, the quaternary sector also includes all other pure services, such as the entertainment industry. There is also the notion of a "quinary sector" which would encompass health, education, culture and research.