Persuasion Bias, Social Influence, and Unidimensional Opinions
提出一个有限理性观点形成模型，认为人们受说服偏见影响，忽视信息重复，导致社会影响现象（影响力取决于网络位置）和观点单维化（多维议题收敛为左右光谱），适用于政治学和营销等领域。
We propose a boundedly rational model of opinion formation in which individuals are subject to persuasion bias; that is, they fail to account for possible repetition in the information they receive. We show that persuasion bias implies the phenomenon of social influence, whereby one's influence on group opinions depends not only on accuracy, but also on how well-connected one is in the social network that determines communication. Persuasion bias also implies the phenomenon of unidimensional opinions; that is, individuals' opinions over a multidimensional set of issues converge to a single "left-right" spectrum. We explore the implications of our model in several natural settings, including political science and marketing, and we obtain a number of novel empirical implications.