Information Structures with Unawareness

I construct a multi-agent state space model with unawareness following Aumann (1976). Dekel, Lipman and Rustichini (1998) show that standard state space models are incapable of representing unawareness. The model circumvents the impossibility result by endowing the agent a subjective state space that differs from the full state space when he has the unawareness problem. Information is modeled as a pair, consisting of both factual information and awareness information. The model exhibits nice properties parallel to those in the standard information partition model.