Expert testimony and practical interests.

We argue that one is likely to accept what a speaker says when the expected utility of accepting their testimony is greater than the expected utility of continuing inquiry. One virtue of our hypothesis is that it allows us to explain why confidence in experts has declined in recent years. In a traditional media landscape expert testimony is easy to find, and alternative sources of information are relatively costly to access. Hence, practical considerations largely favour accepting expert testimony. But on social media, alternative information is easy to find, and it is often practically rational to accept this information rather than to search for (and identify) genuinely expert testimony. [ABSTRACT FROM AUTHOR]