Universal 710: agglutinative ⇒ vowel harmony; flective ⇒ single main stress accent
Original
When stem-suffix combinations are morphologically less cohesive (i.e. agglutinative), words are given unity by vowel harmony; when stems and endings are morphologically more cohesive (i.e. flective), words are given unity by (a single main) stress accent.
Standardized
IF morphology is agglutinative, THEN there is vowel harmony. IF morphology is flexive, THEN there is stress accent.
Cf. #369.