Creation of Feasible Options Through Complementary Support: Why Some Choices Exist Only When Two Contributions Are Combined

This conceptual paper introduces Creation of Feasible Options Through Complementary Support, a mechanism in which resources, tools, or contributions from other people jointly satisfy a task’s constraints. Their combination makes an action feasible that was unavailable under the separate arrangements. The paper distinguishes wanting an action from having a real opportunity to take it. An action not taken may reflect an unavailable option, and successful action after support is added does not alone establish what changed. Assessment requires specifying the task, the constraints each contribution meets, and whether the combination creates a previously unavailable option. The discussion connects the mechanism to Gibson’s account of affordances and examines paired kidney exchange through Anderson and colleagues’ 2015 account. The example concerns two patient–donor pairs whose original pairings are incompatible but whose donors can be matched to the other recipients. It illustrates complementarity at the level of a specified compatibility constraint. Part of the Shared Capacity and Learning series within On Human Modeling, the paper examines how support changes what people can choose and how continuing dependence affects an option’s availability. Its framework can inform human–AI research on whether assistance creates new feasible actions and how systems distinguish unavailable options from a lack of user interest.