If an abstract contains a full extract of an article, then, even if it is published in the journal that is not open access and only Abstract is free; other researchers get benefited. On other hand, if Abstract does not contain full extract of the article; then researchers need to buy the article from the journal & the journal gets the benefits
In my view, an Abstract should contain full extract of the article. So that new researchers and students who are not strong financially may get benefited.
Most of the reputated journals are now not open access, so the only hope for students is 'ABSTRACT' of article which is usually free. So abstract should be elaborative.
Good question - thank you for posing !
The Abstract should be informing to another researcher interested in the topic - and potentially another interested in undertaking related research.
Four key components for the Abstract:
1) What is the rationale for the study? What is being pursued - and why?
2) What is the approach (method)?
3) What are the results?
4) How do the results bear on the rationale for the study (that is, what are the implications of the findings)?
With good wishes !
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