(with Eric van Wincoop)
Journal of International Economics
Abstract: We use Twitter opinions about the Euro-Dollar exchange rate to estimate the private information model of Bacchetta and van Wincoop (2006) and investigate the disconnect between the exchange rate and macro fundamentals over both short and long horizons. We simulate the model with the estimated parameters and replicate the methodology of three studies that document the disconnect empirically. The model is consistent with the findings of the empirical literature, though for a different reason over short than long horizons. Over short horizons private information generates a true disconnect between exchange rates and macro fundamentals that accounts for empirical findings. Over long horizons the theory shows that exchange rate changes are mostly driven by observed fundamentals, but empirical limitations in identifying this long-run relationship often lead to an appearance of disconnect in the data
Journal of Empirical Finance
Abstract: The paper introduces a daily index for expectations of returns based on tweets that express a directional prediction about the stock market index. I develop a dictionary that includes lexicon of traders to identify and classify opinionated tweets. The results show that (1) the Twitter Expectations of Returns Index (TERI) is positively correlated with weekly changes in net long position of investment managers, (2) expectations index of high followers accounts predicts stock market returns, and (3) private information is the primary source of return predictability.