0.0036%

"Marginalization is strangely ignored in the psychological literature: in preparation for writing this chapter we carried out a search of the psycINFO database for the period from 1876 until the present day, using both 'marginalization' and 'marginalisation'. We found 52 items that included the term in the title - of these, only 17 actually dealt with the experience of social marginalization by people in positions of oppression, exclusion, vulnerability or discrimination: the others dealt with things as diverse as a statistical technique or the marginalization of certain professional groups or practices. Curiously, there was no entry at all from before 1982. 

Over 55,000 references are currently added to the database each year, so in the year 2000, for instance, there were two out of 55,000 or 0.0036 per cent of relevant references. Although there will be many more texts that deal with the question (but do not mention it in the title)., this still looks like a remarkable neglect by the established field of psychology." (Kagan & Burton, 2005)

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- Kagan, C. & Burton, M. H. (2005). Marginalization. In: Community Psychology (293-308), link

- photograph by Leon Levinstein via