Abstract. An AG-group ( an AG-groupoid with left identity and inverses)
is a nonassociative structure in general midway between a quasigroup and
an abelian group. This paper is meant to re-start the study of AG-groups.
We prove that for an AG-group associativity and commutativity imply each
other. Nonassociative AG-groups can never be power associative. The duality
between left AG-groups and right AG-groups is also discussed