Using data from agreement in three Algonquian languages (Ojibwe, Cheyenne, and Plains Cree), this squib shows that effects typically attributed to Chomsky’s (2000, 2001) Activity Condition (AC) can vary not only across languages, as in Baker’s (2008b) macroparametric proposal, but within a language as well. AC effects are thus another instance in which an apparent macroparameter turns out, on closer inspection, to be a microparameter instead, as in prominent cases such as the pro-drop parameter and the polysynthesis parameter (Kayne 2005, Baker 2008a).