Focusing on two symmetric merges, namely {XP, YP} and {X, Y}, mainly related to there constructions, the paper discusses Moro's (1997) and Yang's (1999) approaches and the problems raised in them, and presents the solutions based on Chomsky's (2013) label theory. The paper shows that the movement of a syntactic object successfully solves the linearization and label problem yielded by the non-head symmetry of {XP, YP} but cannot those yielded by the head symmetry of {X, Y}. It will be argued that the head symmetry raised in {X, Y} can be accounted for by adopting Boeckx's (2008) Vector Merge, non-movement approach, which provides a point of origin and a point of end in Merge.

• Jaecheol Lee(Daegu University)