This paper investigates whether news suggestive of irrationality within financial markets have an impact on stock returns. We construct a lexicon of words for 'market irrationality' and score daily news articles based on the number and proportion of words they contain from the lexicon. We find...

This Internet Appendix includes supplementary discussion and analyses. The original paper "Capital Market Effects of Media Synthesis and Dissemination: Evidence from Robo-Journalism" is available at the following URL: 'http://ssrn.com/abstract=2872784' http://ssrn.com/abstract=2872784