4 research outputs found
Filtering the intensity of public concern from social media count data with jumps
Count time series obtained from online social media data, such as Twitter,
have drawn increasing interest among academics and market analysts over the
past decade. Transforming Web activity records into counts yields time series
with peculiar features, including the coexistence of smooth paths and sudden
jumps, as well as cross-sectional and temporal dependence. Using Twitter posts
about country risks for the United Kingdom and the United States, this paper
proposes an innovative state space model for multivariate count data with
jumps. We use the proposed model to assess the impact of public concerns in
these countries on market systems. To do so, public concerns inferred from
Twitter data are unpacked into country-specific persistent terms, risk social
amplification events, and co-movements of the country series. The identified
components are then used to investigate the existence and magnitude of
country-risk spillovers and social amplification effects on the volatility of
financial markets
On the" mementum" of Meme Stocks
The meme stock phenomenon has yet to be explored. In this note, we provide evidence that these stocks display common stylized facts for the dynamics of price, trading volume, and social media activity. Using a regime-switching cointegration model, we identify the meme stock “mementum” which exhibits a different characterization compared to other stocks with high volumes of activity (persistent and not) on social media. Finally, we show that mementum is significant and positively related to the stock’s returns. Understanding these properties helps investors and market authorities in their decisions
Google search volumes and the financial markets during the COVID-19 outbreak
During the outbreak of the COVID-19, concerns related to the severity of the pandemic have played a prominent role in investment decisions. In this paper, we analyze the relationship between public attention and the financial markets using search engine data from Google Trends. Our findings show that search query volumes in Italy, Germany, France, Great Britain, Spain, and the United States are connected with stock markets. The Italian Google Trends index is found to be the main driver of all the considered markets. Furthermore, the country-specific market impacts of COVID-19-related concerns closely follow the Italian lockdown process.During the outbreak of the COVID-19, concerns related to the severity of the pandemic have played a prominent role in investment decisions. In this paper, we analyze the relationship between public attention and the financial markets using search engine data from Google Trends. Our findings show that search query volumes in Italy, Germany, France, Great Britain, Spain, and the United States are connected with stock markets. The Italian Google Trends index is found to be the main driver of all the considered markets. Furthermore, the country-specific market impacts of COVID-19-related concerns closely follow the Italian lockdown process