Incomplete-information models of large economies with anonymity : existence and uniqueness of common priors

The paper provides a specification of belief systems for models of large economies with anonymity in which aggregate states depend only on cross-section distributions of types. For belief systems satisfying certain conditions of mutual absolute continuity, the paper gives a necessary and sufficient condition for the existence of a common prior. Under the given conditions, the common prior is unique. -- Large Economy ; Belief systems ; consistency ; common prior