We argue that Agree is an asymmetric relation. According to Asymmetric Agree, if
x Agrees with y, then the features of
y must be properly included in the features of
x. If the links of a chain created by movement are related
by Agree, this correctly predicts the properties of syntactic movement chains.
And if the links of a chain created by movement are subject to the Proper
Inclusion Condition, that accounts for the (un)availability of extraction out of
a moved XP. The following distinctions interact with Asymmetric Agree: whether
movement is A or A-bar, whether or not the constituent extracted out of the
moved phrase is selected by the head of that phrase, and whether movement is
overt or covert. Syntactic movement is feature-structure preserving, in that the
Proper Inclusion Condition applies to sets of features in a particular
configuration.