I'm just having a hard time understanding in which context can double articulation be important and useful. I understood that the first articulation means morphemes and second one means phonemes, and that the definition is therefore : property of speech which allows creation of potentially infinite number of meaningful language sequences out of a limited number of meaningless elements called phonemes.
But still, I don't understand the usefulness of this concept and its main argument. If somebody can explain, would help a lot.
Best regards, Marcello