Norm Enforcement in Markets: Group Identity and the Volunteering of Feedback
通过美德两国市场实验，发现交易者更愿意向同群体成员提供反馈，且社会身份效应强于市场身份，这有助于奖励好表现和惩罚差表现。
Abstract The provision of trader feedback is critical to the functioning of many markets. We examine the influence of group identity on the volunteering and informativeness of feedback. In a market experiment conducted simultaneously in Germany and the United States, we manipulate the interaction of traders based on natural social and induced home market identities. Traders are more likely to provide feedback information on a trader with whom they share a common group identity, and the effect is more pronounced for social identity than for home market identity. Both kinds of group identity promote rewarding good performance and punishing bad performance.