When the private and social benefits of a person's presence in a new country differ, basing admission decisions on willingness to pay may not be the best approach.
当一个人出现在新的国度，其私人收益和社会收益不同时，愿意付费就让其入境的决定可能不是最好的办法。
When the private and social benefits of a person's presence in a new country differ, basing admission decisions on willingness to pay may not be the best approach.
当一个人出现在新的国度，其私人收益和社会收益不同时，愿意付费就让其入境的决定可能不是最好的办法。
应用推荐