Group Polarization in a Model of Information Aggregation
实验发现群体决策比个体更极端但方向一致，本文构建了一个理性决策模型来解释这一现象，并给出了群体最优行动分布比个体更分散的条件。
Experiments identify the empirical regularity that groups tend to make decisions that are more extreme, but in the same direction as the tendency of individual members of the group. We present a model of information aggregation consistent with these findings. We assume individuals and groups are rational decision makers facing monotone statistical decision problems where groups and individuals have common preferences, but groups have superior information. We provide conditions under which the distribution of the optimal actions of the group is more variable than the distribution of actions taken by individuals.