crashes, excess volatility, serially uncorrelated returns, fat-tailed return distributions and volatility clustering, thereby …, speculators' heterogeneity occasionally vanishes, e.g. due to panic-induced herding behavior, yielding extreme returns. Lasting … regimes with high volatility originate from the fact that speculators extract stronger trading signals out of past stock price …

different lexica sentiment variables. These are employed for an analysis of stock reactions: volatility, volume and returns. An … increased (negative) sentiment will influence volatility as well as volume. This influence is contingent on the lexical … produce stock reaction indicators, including volatility, detrended log trading volume and return? (ii) To which degree is …