Chomsky (1991, 1993) and Chomsky and Lasnik (1992) have proposed that syntactic derivations are constrained by the principle of Economy of Derivation. In this article I will show that two direct consequences follow rom this proposal. First, it eliminates a class of derivations involving 'chain interleaving' (section 2). Second, it prohibits certain cases of downward and sideways movement (section 3). To the extent that these consequences are easily verifiable, they provide strong support for such a principle.
Collins, Chris. 1994. Economy of Derivation and the Generalized Proper Binding Condition. Linguistic Inquiry 25.1, 45-61.