Optimal Dynamic Allocation of Attention
研究决策者如何在有偏见的新闻来源间动态分配有限注意力，发现极端信念者强化偏见、温和者反偏见的规律，对理解媒体消费中的回音室效应有启示。
We consider a decision maker (DM) who, before taking an action, seeks information by allocating her limited attention dynamically over different news sources that are biased toward alternative actions. Endogenous choice of information generates rich dynamics: the chosen news source either reinforces or weakens the prior, shaping subsequent attention choices, belief updating, and the final action. The DM adopts a learning strategy biased toward the current belief when the belief is extreme and against that belief when it is moderate. Applied to consumption of news media, observed behavior exhibits an “ echo-chamber” effect for partisan voters and a novel “ anti-echo-chamber” effect for moderates.