It is sometimes argued that an increase in stock market volatility raises required stock returns, and thus lowers stock … for this volatility feedback effect. The resulting model is asymmetric, because volatility feedback amplifies large … for large crashes. The model also implies that volatility feedback is more important when volatility is high. In U …

volatility autocorrelation comes from the fundamental that the trading process is pricing or, is caused by the trading process … itself. Returns and volume data argue, in the context of our model, that persistent volatility is caused by traders … autocorrelation in volatility and volume on the time scale of the trading process which generates returns and volume data. Positive …

stock price reaction to news, and hence lowering the stock return volatility. Thus, in addition to uncertainty about … fundamentals, uncertainty about CEO quality is also a source of stock return volatility, which decreases over a CEO's tenure as the …'s prospects. Overall, uncertainty about management quality appears to be an important source of stock return volatility …

This paper uses a disaggregated approach to study the volatility of common stocks at the market, industry, and firm … levels. Over the period 1962-97 there has been a noticeable increase in firm-level volatility relative to market volatility …, while the number of stocks needed to achieve a given level of diversification has increased. All the volatility measures …

, volatility and stock returns. To do this, we use a large sample of individual accounts over a six-year period in the 1990's in …