Blurb:

This chapter will present cases studies of cumulative effects found with agreement. A major focus will be on deriving dative intervention effects in Icelandic, as well as the well-known person restriction (Sigursson & Holmberg 2008), as gang effects. It will be shown that these two phenomena can be unied in a constraint-based analysis. In addition, the interaction of complementizer agreement and passivization of raised objects in Lubukusu (Diercks 2013) will also be argued to constitute a gang effect with agreement. This chapter
will also assess the prospect of treating well-known cases of hierarchy effects. Building on work by Georgi (2019), it will be shown that the choice of particular agreement controllers in such contexts can be conditioned by low-ranked markedness constraints.