Quaternary sector of industry

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The quaternary sector of industry is an extension of the Three-sector hypothesis of industrial evolution. It is principally concerns the intellectual services: information generation, information sharing, consultation, education and research and development. It is sometimes incorporated into the tertiary sector but many argue that intellectual services are significant enough to warrant a separate sector.

This sector evolves in well developed countries and requires a highly educated workforce.

The quaternary sector can be seen as the sector in which companies invest in order to ensure further expansion. Research will be directed into cutting costs, tapping into markets, producing innovative ideas, new production methods and methods of manufacture, amongst others. To many industries, such as the pharmaceutical industry, the sector is the most valuable because it creates future branded products which the company will profit from.

According to some definitions, the quaternary sector includes other pure services, such as the entertainment industry. There is also the notion of a "Quinary Sector" which would encompass health, culture and research.