If there are causative affixes in a language which serve to form causative verbs from transitives, then this language also has causative affixes which serve to form causative verbs from intransitives.
Standardized
IF there are causative affixes which serve to form causative verbs from transitives, THEN there will be causative affixes which serve to form causative verbs from intransitives.
The reverse assertion does not hold. There are languages in which, with certain exceptions, causative affixes only apply to intransitive verbs: Arabic (Semitic, Afro-Asiatic), Blackfoot (Algonquian), Gothic (Germanic), Indonesian (Malay-Polynesian), Estonian (Finnic, Uralic), Klamath (Klamath-Modoc (=Lutuanian)), Coos (Coosan), Takelma (isolate), and others. It seems that there is no language in which causative affixes are attached only to transitives (Nedjalkov & Sil’nickij 1969: 25-26, 1973: 7).
The reverse assertion does not hold. There are languages in which, with certain exceptions, causative affixes only apply to intransitive verbs: Arabic (Semitic, Afro-Asiatic), Blackfoot (Algonquian), Gothic (Germanic), Indonesian (Malay-Polynesian), Estonian (Finnic, Uralic), Klamath (Klamath-Modoc (=Lutuanian)), Coos (Coosan), Takelma (isolate), and others. It seems that there is no language in which causative affixes are attached only to transitives (Nedjalkov & Sil’nickij 1969: 25-26, 1973: 7).