From:  Who is the author: genuine, honorary, ghost, gold, and fake authors?
 

The pathology of authorship

TerminologyDefinitionExamplesPrevalence
Gift or guest authorHonorary authorSenior academicianVery common (> 50%)
Ghost authorPaid to not author paperSponsor payrollCommon (20–50%)
Gold authorPaid to author the paperAllen’s vodka manUncommon (5–20%)
Fake authorDoes not existS. BestialeRare (< 5%)