holders" for "economy", which are "dispensed" by two vowels: A and Y [ә].
In Russian, for example, there are 6 of them: A E I O U and Y [ә] .
The same pair of vowels (A, Y) with the addition of a long "A" cost
Kabardino-Circassian, Adyghe and Ubykh languages. And there is a
suspicion that all three vowels of these Caucasian languages are only
variants of a single phoneme [ә].
* Are there languages with a single vowel sound?