标题： 如何发起一场草根运动 显示英文标题

标题： How To Start a Grassroots Movement

摘要： 我们研究了促进数字公共产品——一款新冠追踪应用的社会信息的影响。 我们改变受试者是否收到另一名受试者发送的数字信息，以及如果收到，其成本是多少。 观察到发送信息的最大意愿投资各不相同，从1美分到20欧元不等。 这是否会影响接收者的信息发送行为？ 当之前收到该信息时，发送信息的意愿会增加。 然而，成本信号没有影响。 因此，几乎无需成本就可以启动基层运动。 应用支持在规范上很重要，因为未支持者在优先处理中应受到惩罚。 显示英文摘要

摘要： We study the influence of social messages that promote a digital public good, a COVID-19 tracing app. We vary whether subjects receive a digital message from another subject, and, if so, at what cost it came. Observed maximum willingness to invest in sending varies, from 1 cent up to 20 euros. Does this affect receivers' sending behavior? Willingness to invest in sending increases when previously receiving the message. Yet, cost signals have no impact. Thus, grassroots movements can be started at virtually no cost. App-support matters normatively as non-supporters are supposed to be punished in triage.