Assuming Grosu's (1973) decomposition of Ross' (1967) Coordinate Structure Constraint in terms of the Conjunct Constraint and the Element Constraint, this article searches for a principled account for the Conjunct Constraint, rebaptised herein as the Coordinand Constraint. It defends that different families of effects of the Coordinand Constraint are related to different factors: (i) the lexical information provided by a coordinator, (ii) the economy of syntactic displacement operations, and (iii) an interface condition prohibiting self-coordination. These three factors are not primitive, but derive from Chomsky's (1991/1995) Least Effort Principle. Therefore, the Coordinate Constraint is deduced, ultimately, from the Least Effort Principle.

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