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In 1953 a paper was published (On the expansion of the tertiary, quaternary, and quinary sectors,' American Economic Review, May. 1953) by Paul Hatt, and Nelson Foote which

proposed sub-divisions of the service or tertiary industry sector into quaternary and quinary sectors based on information management (4th sector) and knowledge generation (5th sector),

where the term 'quinary' was used to classify industries based on use of knowledge, thus measuring innovation policies and innovation systems.

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