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Published online by Cambridge University Press: 19 February 2026
This article reconsiders the development and licensing of agreement as a syntactic projection and argues for a productive developmental relation between agreement and the category of focus. The authors suggest that focus projections are initially selected by a variety of functional heads with real semantic content. Over time however such selected focus frequently decays into a simple concord shell, and when this occurs, the lower half of the shell becomes a simple agreement projection parasitically licensed by the higher functional head, which does have a genuine semantic value.