Absract:

We introduce and formalize misalignment, i.e., the presence in an interactive environment from an analyst’s perspective of at least an agent holding beliefs on another agent that do not match any beliefs actually embraced by this latter agent, and we show how standard frameworks used to model interactive reasoning such as type structures fail to capture it. We characterize misalignment via the notion of non-belief closed state space and we introduce agent-dependent type structures to capture it and to show that this is a multifaceted phenomenon which manifests itself in varying degrees. Finally, we establish that usual modal operators appropriately defined on agent-dependent type structures are well-behaved and we exploit them to show that common belief of willingness to trade along with a common prior appropriately defined do not preclude speculative trade under misalignment.

Location:

Room 2E29, CEPS ENS Paris-Saclay
4 avenue des Sciences, 91190, Gif-sur-Yvette